{"id":180609,"date":"2026-08-17T09:21:25","date_gmt":"2026-08-17T09:21:25","guid":{"rendered":"https:\/\/pabau.com\/?p=180609"},"modified":"2026-08-17T09:21:27","modified_gmt":"2026-08-17T09:21:27","slug":"icd-10-code-s66299d","status":"publish","type":"post","link":"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-s66299d\/","title":{"rendered":"ICD-10 Code S66.299D: Thumb extensor injury, subsequent encounter"},"content":{"rendered":"\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"MedicalWebPage\",\"headline\":\"ICD-10 Code S66.299D: Other specified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, subsequent encounter\",\"description\":\"ICD-10 Code S66.299D (other specified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, subsequent encounter) is a billable 2026 ICD-10-CM diagnosis code. Learn code details, 7th character rules, related thumb codes, and documentation requirements.\",\"url\":\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-s66299d\/\",\"audience\":{\"@type\":\"MedicalAudience\",\"audienceType\":\"Clinician\"},\"reviewedBy\":{\"@type\":\"Person\",\"name\":\"Dr Vanja Kitanova\",\"jobTitle\":\"Medical Reviewer\",\"affiliation\":{\"@type\":\"Organization\",\"name\":\"Pabau\"},\"knowsAbout\":[\"Medical Coding\",\"Clinical Documentation\",\"Healthcare Billing\",\"Clinical Safety\"],\"sameAs\":\"https:\/\/pabau.com\/blog\/author\/vanja\/\"},\"datePublished\":\"2026-08-01\",\"dateModified\":\"2026-08-17\"}<\/script>\n\n\n        <div id=\"key_takeaways\">\n            <div class=\"header\">\n                                    <img decoding=\"async\" src=\"https:\/\/pabau.com\/wp-content\/uploads\/2025\/12\/Key-Takeaways-Icon.svg\" alt=\"Key takeaways\" height=\"42\" width=\"42\">\n                                <h3>Key takeaways<\/h3>\n            <\/div>\n            <div class=\"list\">\n                                                            <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#3D3D46\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p>S66.299D is a billable ICD-10-CM code for other specified injury of the extensor muscle, fascia and tendon of the unspecified thumb, subsequent encounter.<\/p>\n                        <\/div>\n                                                                                <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#3D3D46\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p>The code describes the thumb, not a finger. Extensor injuries to the fingers sit in a separate subcategory, S66.3.<\/p>\n                        <\/div>\n                                                                                <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#3D3D46\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p>In S66.299D, unspecified means the note does not record whether the right or left thumb was injured.<\/p>\n                        <\/div>\n                                                                                <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#3D3D46\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p>The 7th character D marks a subsequent encounter, when the patient is in follow-up care and the injury is still healing.<\/p>\n                        <\/div>\n                                                                                <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#3D3D46\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p>Practice management software like Pabau keeps the encounter note and the diagnosis code together, so subsequent-encounter claims carry the documentation payers ask for.<\/p>\n                        <\/div>\n                                                <\/div>\n        <\/div>\n    \n\n\n<p class=\"wp-block-paragraph\">ICD-10 Code S66.299D is a billable ICD-10-CM diagnosis code. It covers other specified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, subsequent encounter. It applies at follow-up visits, once treatment of a thumb extensor injury is already under way.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Two words in that descriptor do most of the work. <strong>Thumb<\/strong> narrows the code to the extensor structures of the first digit. That is what separates S66.299D from the finger codes it is often confused with. <strong>Unspecified<\/strong> refers to the side, not the digit: the note does not say whether the right or left thumb was injured.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This code is valid for HIPAA-covered electronic transactions and belongs to the 2026 ICD-10-CM edition, effective October 1, 2025. It sits in the S66.2 subcategory, which covers injury of the extensor muscle, fascia and tendon of the thumb at wrist and hand level.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"ICD-10 Revisions: Stay Updated or Fall Behind\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/bqAyb-BCA0w?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<h2 id=\"h-s66-299d-at-a-glance\" class=\"wp-block-heading\">S66.299D at a glance<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The table below sets out the attributes coders and clinicians check before submitting a claim on this code.<\/p>\n\n\n\n<table style=\"width:100%;border-collapse:separate;border-spacing:0;border-radius:12px;overflow:hidden;font-size:15px;line-height:1.5;margin:1.5em 0 2em;box-shadow:0 2px 12px rgba(0,0,0,0.08)\">\n<thead>\n<tr>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Attribute<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Detail<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Code<\/td>\n<td style=\"padding:12px 16px;color:#374151\">S66.299D<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Full description<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Other specified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, subsequent encounter<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Short description<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Inj extensor musc\/fasc\/tend thmb at wrs\/hnd lv, subs<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Body part<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Thumb (first digit), side not documented<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Billable\/specific<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Yes<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Valid for claims<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Yes (HIPAA-covered transactions)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">ICD-10-CM edition<\/td>\n<td style=\"padding:12px 16px;color:#374151\">2026 (effective October 1, 2025)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">POA exempt<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Yes, S66.299D is exempt from present-on-admission reporting<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">7th character<\/td>\n<td style=\"padding:12px 16px;color:#374151\">D = subsequent encounter<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Subcategory<\/td>\n<td style=\"padding:12px 16px;color:#374151\">S66.2 (Injury of extensor muscle, fascia and tendon of thumb at wrist and hand level)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">MS-DRG grouping<\/td>\n<td style=\"padding:12px 16px;color:#374151\">949 and 950 (aftercare, with and without CC\/MCC)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">The MS-DRG grouping is a useful sanity check. A code that groups to aftercare should be paired with a note that describes continuing care, not a fresh injury workup.<\/p>\n\n\n\n<h2 id=\"h-what-the-7th-character-d-means\" class=\"wp-block-heading\">What the 7th character D means<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Seventh character conventions are among the most misapplied elements of injury coding. The S66.299 code has three options, and choosing the wrong one affects claim validity. Fracture categories carry a longer list, which is why a code such as <a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-s42302k\/\">S42.302K<\/a> exists for nonunion.<\/p>\n\n\n\n<table style=\"width:100%;border-collapse:separate;border-spacing:0;border-radius:12px;overflow:hidden;font-size:15px;line-height:1.5;margin:1.5em 0 2em;box-shadow:0 2px 12px rgba(0,0,0,0.08)\">\n<thead>\n<tr>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">7th character<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Full code<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">When to use<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">A (initial encounter)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">S66.299A<\/td>\n<td style=\"padding:12px 16px;color:#374151\">First time the patient receives active treatment for this thumb extensor injury<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">D (subsequent encounter)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">S66.299D<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Patient is in routine or ongoing care after the initial treatment episode. The injury is still in the active healing phase<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">S (sequela)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">S66.299S<\/td>\n<td style=\"padding:12px 16px;color:#374151\">A late effect that arises as a direct consequence of the original thumb injury, once healing is complete<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">Under the <a href=\"https:\/\/www.cms.gov\/medicare\/coding-billing\/icd-10-codes\" target=\"_blank\" rel=\"nofollow noopener\">ICD-10-CM Official Guidelines<\/a>, character D marks active treatment of an injury that is still healing. The visit number has nothing to do with it. A patient who attends three consecutive hand therapy sessions for the same thumb extensor injury is coded S66.299D at each one. That holds for as long as active treatment continues.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Character S applies only after healing is complete and the patient presents with a persistent problem caused by the original injury. Loss of thumb interphalangeal extension is a common example. Do not use S66.299S while the original injury is still being managed.<\/p>\n\n\n        <div id=\"pro_tip\">\n            <div class=\"img\">\n                <svg width=\"42\" height=\"42\" viewBox=\"0 0 42 42\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                    <path fill-rule=\"evenodd\" clip-rule=\"evenodd\"\n                        d=\"M12.6383 19.5238C12.6632 21.2071 12.8734 22.9926 12.0685 24.5523C11.0341 26.8917 8.45076 28.169 7.56292 30.5918C6.63082 33.1061 7.19505 36.185 9.31371 37.9786C10.929 39.5678 13.4183 39.9873 15.6061 39.5463C17.4592 39.073 19.1049 37.8388 19.9706 36.1608C20.781 34.7141 20.7866 32.9904 20.5293 31.3985C20.1006 29.3092 18.3775 27.8705 16.9807 26.362C14.8814 24.1005 14.6684 20.6854 15.595 17.8915C16.4331 15.4768 19.0026 14.2344 20.0425 11.9461C20.7202 10.6769 20.7506 9.20327 20.6068 7.81304C20.1864 5.40098 18.3139 3.23631 15.8716 2.56674C13.9742 2.03969 11.8224 2.30052 10.1739 3.37614C8.70522 4.34688 7.5878 5.86618 7.28356 7.58178C6.76081 9.82981 7.53525 12.2822 9.20307 13.9118C10.7658 15.4741 12.4806 17.2273 12.6383 19.5238Z\"\n                        fill=\"#2BADD4\" \/>\n                    <path fill-rule=\"evenodd\" clip-rule=\"evenodd\"\n                        d=\"M22.7048 19.8387C22.6822 22.3279 24.4507 24.6234 26.7493 25.4682C28.0531 25.961 29.4725 25.9183 30.7989 25.5487C32.0575 24.9955 33.301 24.2237 34.0069 23.0092C34.8384 21.5811 35.2982 19.8286 34.7832 18.2094C34.3611 16.2507 32.8739 14.6541 31.0275 13.9426C28.6736 12.9595 25.8073 13.7942 24.1719 15.7001C23.2022 16.8366 22.6143 18.3326 22.7048 19.8387Z\"\n                        fill=\"#2BADD4\" \/>\n                <\/svg>\n            <\/div>\n            <div class=\"text\">\n                <h3>Pro Tip<\/h3>\n                <p>Audit your encounter notes before you pick the 7th character. If the note references ongoing wound care, thumb spica splint management, or a tendon gliding program, D is correct. If it describes a new complaint arising from a fully healed injury, consider S.<\/p>\n            <\/div>\n        <\/div>\n    \n\n\n<h2 id=\"h-the-thumb-extensor-structures-at-wrist-and-hand-level\" class=\"wp-block-heading\">The thumb extensor structures at wrist and hand level<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The S66.2 subcategory covers a narrow anatomical zone. It holds the extensor musculotendinous structures that act on the thumb, along the dorsal and radial side of the wrist and hand. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Knowing which structures belong here helps when choosing between sibling codes. Hand injuries fill the caseload in <a href=\"https:\/\/pabau.com\/industry\/physical-therapy-emr\/\">physical therapy practices<\/a>, so these tendon names appear in notes weekly.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Extensor pollicis longus:<\/strong> runs in the third dorsal compartment, turns around Lister&#8217;s tubercle, and extends the thumb interphalangeal joint<\/li>\n\n\n\n<li><strong>Extensor pollicis brevis:<\/strong> runs in the first dorsal compartment and extends the thumb metacarpophalangeal joint<\/li>\n\n\n\n<li><strong>Abductor pollicis longus:<\/strong> shares the first dorsal compartment with extensor pollicis brevis and is usually documented alongside it<\/li>\n\n\n\n<li><strong>Associated fascia:<\/strong> the extensor retinaculum and dorsal hand fascia, which hold the tendons in their compartments and allow them to glide<\/li>\n\n\n\n<li><strong>The anatomical snuffbox:<\/strong> the hollow bounded by these three tendons, and a reliable landmark in the operative or examination note<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Extensor pollicis longus rupture after a distal radius fracture is the classic presentation behind an other specified injury code. The tendon frays where it crosses Lister&#8217;s tubercle, often weeks after the fracture itself. Those visits are subsequent encounters, which is why S66.299D turns up more often than the initial-encounter version.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Unspecified thumb in the descriptor means the documentation does not state a side. Treat it as a default of last resort. If the chart says right thumb, S66.291D is available and preferred. The ICD-10-CM tabular list, accessible through the <a href=\"https:\/\/icd10cmtool.cdc.gov\/\" target=\"_blank\" rel=\"nofollow noopener\">CDC\/NCHS ICD-10-CM web tool<\/a>, lists each side separately.<\/p>\n\n\n\n<h2 id=\"h-s66-299d-in-the-icd-10-code-hierarchy\" class=\"wp-block-heading\">S66.299D in the ICD-10 code hierarchy<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Placing S66.299D in its full hierarchy shows which parent chapters govern its conventions. It also shows which sibling codes open up once the documentation improves. Every traumatic injury category follows the same parent-to-child structure.<\/p>\n\n\n\n<table style=\"width:100%;border-collapse:separate;border-spacing:0;border-radius:12px;overflow:hidden;font-size:15px;line-height:1.5;margin:1.5em 0 2em;box-shadow:0 2px 12px rgba(0,0,0,0.08)\">\n<thead>\n<tr>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Level<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Code<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Description<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Chapter<\/td>\n<td style=\"padding:12px 16px;color:#374151\">S00-T88<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Injury, poisoning and certain other consequences of external causes<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Block<\/td>\n<td style=\"padding:12px 16px;color:#374151\">S60-S69<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Injuries to the wrist, hand and fingers<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Category<\/td>\n<td style=\"padding:12px 16px;color:#374151\">S66<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Injury of muscle, fascia and tendon at wrist and hand level<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Subcategory<\/td>\n<td style=\"padding:12px 16px;color:#374151\">S66.2<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Injury of extensor muscle, fascia and tendon of thumb at wrist and hand level<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Subcategory<\/td>\n<td style=\"padding:12px 16px;color:#374151\">S66.29<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Other specified injury of extensor muscle, fascia and tendon of thumb at wrist and hand level<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Code (no 7th character)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">S66.299<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Other specified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Billable code<\/td>\n<td style=\"padding:12px 16px;color:#374151\">S66.299D<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Other specified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, subsequent encounter<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">Read the sixth character as laterality. In the S66.29 series, 1 is the right thumb, 2 is the left thumb, and 9 is the unspecified thumb. No character in this code identifies a finger, because no finger belongs to it.<\/p>\n\n\n\n<h2 id=\"h-thumb-or-finger-s66-299d-versus-s66-399d\" class=\"wp-block-heading\">Thumb or finger: S66.299D versus S66.399D<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">S66.299D covers the thumb. The code for an unspecified finger is S66.399D, and it belongs to a different subcategory. Because the two look almost identical on screen, they are a common transposition error in hand and physical therapy billing.<\/p>\n\n\n\n<table style=\"width:100%;border-collapse:separate;border-spacing:0;border-radius:12px;overflow:hidden;font-size:15px;line-height:1.5;margin:1.5em 0 2em;box-shadow:0 2px 12px rgba(0,0,0,0.08)\">\n<thead>\n<tr>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Code<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Subcategory<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Digit covered<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">S66.299D<\/td>\n<td style=\"padding:12px 16px;color:#374151\">S66.2, extensor structures of the thumb<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Thumb, side not documented<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">S66.399D<\/td>\n<td style=\"padding:12px 16px;color:#374151\">S66.3, extensor structures of other and unspecified finger<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Finger, digit not documented<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">The wording differs too. S66.29 codes read other specified injury, while the S66.39 codes read other injury. If a clinical note names the thumb, S66.299D is the family to work in. If it names any of the four fingers, move to S66.3 and pick the digit.<\/p>\n\n\n\n<h2 id=\"h-related-icd-10-codes-for-thumb-extensor-injuries\" class=\"wp-block-heading\">Related ICD-10 codes for thumb extensor injuries<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Coders working on thumb extensor injuries need to separate several closely related codes. The table below covers the siblings that come up most often, including the laterality-specific versions that apply once documentation improves. Certified hand therapists in <a href=\"https:\/\/pabau.com\/industry\/occupational-therapy-software\/\">occupational therapy practices<\/a> meet most of them.<\/p>\n\n\n\n<table style=\"width:100%;border-collapse:separate;border-spacing:0;border-radius:12px;overflow:hidden;font-size:15px;line-height:1.5;margin:1.5em 0 2em;box-shadow:0 2px 12px rgba(0,0,0,0.08)\">\n<thead>\n<tr>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Code<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Description<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">When to use<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">S66.299A<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Other specified injury of extensor muscle, fascia and tendon of unspecified thumb, initial encounter<\/td>\n<td style=\"padding:12px 16px;color:#374151\">First active-treatment encounter, side still undocumented<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">S66.299S<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Same descriptor, sequela<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Late effects after healing, such as a residual thumb extension deficit<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">S66.291D<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Other specified injury of extensor muscle, fascia and tendon of right thumb, subsequent encounter<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Same encounter type, with the right thumb documented<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">S66.292D<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Other specified injury of extensor muscle, fascia and tendon of left thumb, subsequent encounter<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Same encounter type, with the left thumb documented<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">S66.219D<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Strain of extensor muscle, fascia and tendon of unspecified thumb, subsequent encounter<\/td>\n<td style=\"padding:12px 16px;color:#374151\">The note names a strain rather than an other specified injury<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">S66.229D<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Laceration of extensor muscle, fascia and tendon of unspecified thumb, subsequent encounter<\/td>\n<td style=\"padding:12px 16px;color:#374151\">The injury is a laceration of the thumb extensor structure<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">S66.209D<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Unspecified injury of extensor muscle, fascia and tendon of unspecified thumb, subsequent encounter<\/td>\n<td style=\"padding:12px 16px;color:#374151\">The note confirms a thumb extensor injury but names no injury type<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">S66.399D<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Other injury of extensor muscle, fascia and tendon of unspecified finger, subsequent encounter<\/td>\n<td style=\"padding:12px 16px;color:#374151\">The injured digit is a finger, not the thumb<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Key distinction:<\/strong> what separates S66.299A from S66.299D is the treatment phase, and the visit count never enters into it. A patient who self-treats for three weeks, then presents to a practice for the first time, is coded A at that first visit. Switch to D at the next encounter, once initial treatment has been established.<\/p>\n\n\n\n<h2 id=\"h-excludes-notes-and-tabular-instructions\" class=\"wp-block-heading\">Excludes notes and tabular instructions<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Several instructional notes sit above S66.299D in the tabular list and carry down to it. Reading them before you submit prevents the two most common denials on this code. Those are a missing external cause code, and a wound coded in the wrong place.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Chapter note (S00-T88):<\/strong> add a secondary code from Chapter 20 to identify the external cause of the injury. Payers often reject a subsequent-encounter injury claim that carries no cause<\/li>\n\n\n\n<li><strong>Use additional code (S00-T88):<\/strong> report any retained foreign body with a code from Z18.-<\/li>\n\n\n\n<li><strong>Code also (S66):<\/strong> report any associated open wound from the S61.- series, such as S61.009D for an open wound of an unspecified thumb<\/li>\n\n\n\n<li><strong>Type 2 excludes (S66):<\/strong> sprain of the joints and ligaments of the wrist and hand belongs in the S63 series, such as <a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-s63501d\/\">S63.501D<\/a><\/li>\n\n\n\n<li><strong>Type 2 excludes (S60-S69):<\/strong> burns and corrosions (T20-T32), frostbite (T33-T34), and venomous insect bite or sting (T63.4) are coded elsewhere<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Non-traumatic thumb tendon problems are a separate matter and never take an S66 code. De Quervain&#8217;s radial styloid tenosynovitis is <a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-m654\/\">M65.4<\/a>, and trigger thumb sits in the M65.31- series.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Both are overuse conditions rather than injuries, so a note describing gradual onset should push you out of Chapter 19. A tendon that gives way with no trauma behind it belongs to <a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-m669\/\">M66.9<\/a>.<\/p>\n\n\n\n<h2 id=\"h-clinical-synonyms-and-approximate-terms\" class=\"wp-block-heading\">Clinical synonyms and approximate terms<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The ICD-10-CM alphabetic index maps several clinical descriptions to this code. Coders who search by diagnosis text rather than by code number can use the approximate terms below. Cross-referencing against the <a href=\"https:\/\/www.aapc.com\/codes\/icd-10-codes-range\/\" target=\"_blank\" rel=\"nofollow noopener\">AAPC Codify ICD-10-CM lookup<\/a> confirms these mappings.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Other specified injury of thumb extensor tendon at hand level, subsequent encounter<\/li>\n\n\n\n<li>Other specified injury of thumb extensor fascia at wrist level, subsequent encounter<\/li>\n\n\n\n<li>Extensor pollicis longus injury, thumb, follow-up visit<\/li>\n\n\n\n<li>Extensor pollicis brevis injury, thumb, subsequent encounter<\/li>\n\n\n\n<li>Injury of the dorsal extensor mechanism of the thumb, subsequent encounter<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These synonyms do not change the billable code. They exist as index reference points, so a practitioner searching by clinical description still lands on S66.299D.<\/p>\n\n\n\n<h2 id=\"h-documentation-requirements-for-s66-299d\" class=\"wp-block-heading\">Documentation requirements for S66.299D<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Billing S66.299D without adequate documentation exposes the claim to denial or audit. Injury codes demand specificity at every encounter, not only at the original presentation. The note must support each element of the code.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A well-structured encounter note for S66.299D should cover the points below. <a href=\"https:\/\/pabau.com\/features\/medical-records-management\/\">Structured patient record documentation<\/a> keeps these elements consistent across providers and locations.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/cdn.pabau.com\/cdn\/attachments\/pulse\/content-engine\/diagnostic_codes\/icd-10-code-s66299d\/comprehensive-emr-patient-record-management.webp\" alt=\"Comprehensive EMR and patient record management in Pabau\"\/><figcaption class=\"wp-element-caption\"><em>Pabau&#8217;s EMR holds every treatment note, form, and uploaded document on one client record, so each subsequent encounter carries its evidence.<\/em><\/figcaption><\/figure>\n\n\n\n<div style=\"height:35px;width:800px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Injury type:<\/strong> the note must describe an other specified injury of a thumb extensor structure. That phrase means the injury does not match a more specific code such as a strain or a laceration. Document the nature of the injury, for example partial disruption, attritional rupture, or contusion with tendon involvement<\/li>\n\n\n\n<li><strong>Anatomical structure:<\/strong> name the extensor muscle, fascia, or tendon involved. Extensor pollicis longus and extensor pollicis brevis are the two most often cited, and either one anchors the code to the thumb<\/li>\n\n\n\n<li><strong>Encounter type:<\/strong> confirm that this is a follow-up visit for an injury already under treatment. Phrases such as returning for continued management or ongoing rehabilitation support character D<\/li>\n\n\n\n<li><strong>Thumb laterality:<\/strong> if the note does not say right or left, explain why. Swelling that prevents side-specific assessment is a defensible reason. Unexplained unspecified coding draws auditor attention, and the specific codes S66.291D and S66.292D are always preferred<\/li>\n\n\n\n<li><strong>Treatment provided:<\/strong> record what active care was delivered, such as a thumb spica splint adjustment, therapeutic exercise, wound review, or a tendon gliding protocol<\/li>\n<\/ul>\n\n\n\n<h2 id=\"h-coding-guidelines-and-billing-notes\" class=\"wp-block-heading\">Coding guidelines and billing notes<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">S66.299D is valid for submission under HIPAA-covered electronic transactions and is exempt from present-on-admission reporting. Understanding the <a href=\"https:\/\/pabau.com\/blog\/hipaa-compliance-for-medical-offices\/\">HIPAA-covered transaction requirements<\/a> for diagnosis code submission prevents common administrative errors.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">From a billing workflow perspective, several practical points apply. Practices that rely on efficient <a href=\"https:\/\/pabau.com\/features\/claims-management-software\/\">claims management workflows<\/a> can use these notes when configuring payer-specific rules.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/cdn.pabau.com\/cdn\/attachments\/pulse\/content-engine\/diagnostic_codes\/icd-10-code-s66299d\/automate-claims-through-healthcode.webp\" alt=\"Automated insurer claim and invoice generated at checkout in Pabau\"\/><figcaption class=\"wp-element-caption\"><em>Pabau raises the insurer invoice at checkout, so a subsequent-encounter thumb injury visit reaches the payer with its diagnosis code attached.<\/em><\/figcaption><\/figure>\n\n\n\n<div style=\"height:35px;width:800px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Sequencing:<\/strong> S66.299D is usually the principal diagnosis at a subsequent encounter focused on the thumb extensor injury. If the visit also addresses a co-morbidity that drives extra resource use, standard sequencing guidelines apply<\/li>\n\n\n\n<li><strong>CPT pairing (illustrative):<\/strong> follow-up visits on this code often carry 97110 for therapeutic exercise, 97530 for therapeutic activities, or 97035 for ultrasound. Final pairing depends on the provider&#8217;s documentation and payer policy, so verify against local coverage determinations<\/li>\n\n\n\n<li><strong>Payer variation:<\/strong> local and national coverage determinations may set extra requirements for extensor tendon injury codes. Some payers ask for a mechanism-of-injury statement before they will pay the claim<\/li>\n\n\n\n<li><strong>Do not swap in a follow-up Z code:<\/strong> the Official Guidelines separate a subsequent encounter from aftercare or follow-up codes such as Z09. Use S66.299D while active treatment of the injury continues, and a Z code only once the injury has resolved<\/li>\n\n\n\n<li><strong>Laterality queries pay for themselves:<\/strong> a single query that converts S66.299D to S66.291D or S66.292D removes the unspecified flag that many payer edits look for<\/li>\n<\/ul>\n\n\n\n<h2 id=\"h-code-history-and-year-status\" class=\"wp-block-heading\">Code history and 2026 status<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">S66.299D has been stable since ICD-10-CM went live in the United States. It entered the code set for fiscal year 2016 and has carried the same descriptor in every annual update since, including the 2026 edition.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>FY2016 (effective October 1, 2015):<\/strong> new code in the first non-draft ICD-10-CM release<\/li>\n\n\n\n<li><strong>FY2017 to FY2025:<\/strong> no change to the code or its descriptor in any annual update<\/li>\n\n\n\n<li><strong>FY2026 (effective October 1, 2025):<\/strong> no change, and the code remains billable and valid for claims<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Stability is convenient, but it also means an incorrect mapping in your code library can sit undetected for years. If your system has ever labeled S66.299D as a finger code, correct the description now and re-check any claim history built on it.<\/p>\n\n\n\n<h2 id=\"h-how-pabau-supports-accurate-thumb-injury-coding\" class=\"wp-block-heading\">How Pabau supports accurate thumb injury coding<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Subsequent-encounter denials usually trace back to the note rather than the claim. A therapist records a thumb splint review in one system, the coder picks a diagnosis in another, and nothing links the two. When the payer asks why the side was left unspecified, the answer sits in a note nobody can find quickly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pabau is practice management software that keeps the clinical record and the billing record in the same place. The treatment note, the consent form, and the uploaded imaging all attach to the same client record. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The evidence behind an S66.299D claim travels with it. Every subscription includes every feature, so documentation and billing are never split across plans.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At checkout, the visit becomes an invoice or an insurer claim without a second data entry step. That matters on a code like this one, where the same diagnosis repeats across weeks of hand therapy. Your team codes once, then repeats the encounter with the documentation already attached.<\/p>\n\n\n        <div id=\"book_a_demo\">\n            <div class=\"left-side\">\n                <div class=\"logo\">\n                    <img decoding=\"async\"\n                        src=\"https:\/\/pabau.com\/wp-content\/uploads\/2026\/01\/Logo.svg\"\n                        alt=\"Logo\"\n                        loading=\"lazy\"\n                    \/>\n                <\/div>\n\n                <h3 class=\"heading\">\n                    Keep ICD-10 coding and claims in one record                <\/h3>\n\n                <p class=\"description\">\n                    Pabau ties each treatment note to the diagnosis code and the claim it supports, so repeat injury encounters reach the payer with their evidence attached. Your team spends less time rebuilding documentation after a denial.                <\/p>\n\n                <div class=\"button-group\">\n                    <a href=\"\/book-demo\/\" class=\"btn btn-scale-effect btn-cta-color btn-md\">\n                        <span class=\"btn-text\">Book a demo<\/span>\n                        <div class=\"btn-icon btn-icon-right\" aria-hidden=\"true\">\n                            <svg\n                                width=\"14\"\n                                height=\"12\"\n                                viewBox=\"0 0 14 12\"\n                                fill=\"none\"\n                                xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n                            >\n                                <path\n                                    d=\"M0.75 4.77295C0.335786 4.77295 0 5.10874 0 5.52295C0 5.93716 0.335786 6.27295 0.75 6.27295V5.52295V4.77295ZM13.2803 6.05328C13.5732 5.76039 13.5732 5.28551 13.2803 4.99262L8.50736 0.219648C8.21447 -0.073245 7.73959 -0.073245 7.4467 0.219648C7.15381 0.512542 7.15381 0.987415 7.4467 1.28031L11.6893 5.52295L7.4467 9.76559C7.15381 10.0585 7.15381 10.5334 7.4467 10.8263C7.73959 11.1191 8.21447 11.1191 8.50736 10.8263L13.2803 6.05328ZM0.75 5.52295V6.27295L12.75 6.27295V5.52295V4.77295L0.75 4.77295V5.52295Z\"\n                                    fill=\"currentColor\"\n                                ><\/path>\n                            <\/svg>\n                        <\/div>\n                    <\/a>\n                <\/div>\n            <\/div>\n\n            <div class=\"right-side\">\n                <img decoding=\"async\"\n                    src=\"https:\/\/pabau.com\/wp-content\/uploads\/2026\/01\/Home-Page-Concept-4.webp\"\n                    alt=\"Pabau clinic management dashboard\"\n                    loading=\"lazy\"\n                \/>\n            <\/div>\n        <\/div>\n        \n\n\n<h2 id=\"h-conclusion\" class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Treat S66.299D as a thumb code first and a subsequent-encounter code second. Get the digit right and the rest of the decision tree behaves. Laterality, injury type, and 7th character all follow from a note that names the structure and the phase of care.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The trade-off worth remembering is that unspecified is legal but expensive. It passes the edit and still invites the query, so a one-line laterality prompt in your intake template usually pays for itself within a month.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pabau holds the code, the note, and the claim in one platform, which is what keeps repeat encounters clean. <a href=\"https:\/\/pabau.com\/book-demo\/\">Book a demo<\/a> to see how Pabau reduces coding rework on hand injury follow-up visits.<\/p>\n\n\n        <div id=\"expert_picks\">\n            <div class=\"header\">\n                                    <img decoding=\"async\" src=\"https:\/\/pabau.com\/wp-content\/uploads\/2025\/11\/Expert-Picks.svg\" alt=\"Continue your research\" height=\"42\" width=\"42\">\n                                <h3>Continue your research<\/h3>\n            <\/div>\n            <div class=\"content\">\n                                                            <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#54B2D3\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p><strong>Need the initial-encounter version of this rule?<\/strong> <a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-s33140a\/\">S33.140A<\/a> walks through how the A extension behaves on a spinal injury.<\/p>\n                        <\/div>\n                                                                                <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#54B2D3\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p><strong>Coding an open fracture instead?<\/strong> <a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-s32462b\/\">S32.462B<\/a> covers the B extension and the documentation an open injury claim needs.<\/p>\n                        <\/div>\n                                                                                <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#54B2D3\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p><strong>Billing a procedure alongside the diagnosis?<\/strong> <a href=\"https:\/\/pabau.com\/procedure-codes\/cpt-code-25492\/\">25492<\/a> explains how procedure coding works for the radius and ulna.<\/p>\n                        <\/div>\n                                                                                <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#54B2D3\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p><strong>Submitting these claims to Medicare?<\/strong> <a href=\"https:\/\/pabau.com\/blog\/medicare-billing\/\">Medicare billing for practices<\/a> sets out the claiming channels and the rules behind each one.<\/p>\n                        <\/div>\n                                                                                <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#54B2D3\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p><strong>Planning the rehab side of an upper limb injury?<\/strong> <a href=\"https:\/\/pabau.com\/blog\/brachial-neuritis-exercises\/\">Brachial neuritis exercises<\/a> sets out what to do in each phase of recovery.<\/p>\n                        <\/div>\n                                                <\/div>\n        <\/div>\n    \n\n\n<h2 id=\"h-frequently-asked-questions\" class=\"wp-block-heading\">Frequently asked questions<\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1786714452031\"><h3 class=\"schema-faq-question\">What does ICD-10 Code S66.299D mean?<\/h3> <p class=\"schema-faq-answer\">S66.299D is a billable ICD-10-CM code. It covers other specified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, subsequent encounter. It applies when a patient returns for ongoing treatment of a thumb extensor injury that is still healing. The note does not record which thumb was injured.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1786714452032\"><h3 class=\"schema-faq-question\">Does S66.299D apply to the thumb or to a finger?<\/h3> <p class=\"schema-faq-answer\">S66.299D applies to the thumb only. Its parent subcategory, S66.2, covers injury of the extensor muscle, fascia and tendon of the thumb at wrist and hand level. Extensor injuries to the four fingers belong to S66.3, where the equivalent unspecified-digit subsequent-encounter code is S66.399D.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1786714452033\"><h3 class=\"schema-faq-question\">What does unspecified mean in S66.299D?<\/h3> <p class=\"schema-faq-answer\">It refers to laterality, not to the digit. The sixth character in the S66.29 series records the side. Use 1 for the right thumb, 2 for the left thumb, and 9 for an unspecified thumb. If the note names a side, use S66.291D or S66.292D instead.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1786714452034\"><h3 class=\"schema-faq-question\">Is S66.299D a billable ICD-10-CM code?<\/h3> <p class=\"schema-faq-answer\">Yes. S66.299D is a billable, specific ICD-10-CM code valid for HIPAA-covered electronic transactions in the 2026 edition, effective October 1, 2025. It can be used on a claim without a further level of detail, and it is exempt from present-on-admission reporting.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1786714452035\"><h3 class=\"schema-faq-question\">What is the difference between S66.299A and S66.299D?<\/h3> <p class=\"schema-faq-answer\">S66.299A is the initial encounter, meaning the first time the patient receives active treatment for this thumb extensor injury. S66.299D covers every follow-up visit while the injury is still in the active healing phase. The distinction rests on the treatment phase, not on how many visits have taken place.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1786714452036\"><h3 class=\"schema-faq-question\">When should you use the seventh character D in ICD-10 injury coding?<\/h3> <p class=\"schema-faq-answer\">Use D whenever the patient is receiving routine or ongoing active treatment for an injury established at an earlier encounter. Active treatment includes hand therapy, wound care, splinting, and rehabilitation. Switch to S for sequela only after the original injury has healed and a late effect remains.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1786714452037\"><h3 class=\"schema-faq-question\">What documentation is required to bill S66.299D?<\/h3> <p class=\"schema-faq-answer\">The note must record four things. First, an other specified injury of the thumb extensor muscle, fascia, or tendon. Second, that this is a subsequent visit for an injury already under treatment. Third, why the side is not documented. Fourth, what care was delivered at this encounter. Individual payer coverage determinations may add requirements.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1786714452038\"><h3 class=\"schema-faq-question\">What is the difference between S66.299D and S66.299S?<\/h3> <p class=\"schema-faq-answer\">S66.299D means the patient is in active treatment and the thumb injury is still healing. S66.299S means the injury has healed but left a late effect, such as a persistent extension deficit or restrictive scar tissue. Do not use S66.299S while the original injury is still being actively managed.<\/p> <\/div> <\/div>\n","protected":false},"excerpt":{"rendered":"<p>ICD-10 Code S66.299D is a billable ICD-10-CM diagnosis code. It covers other specified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, subsequent encounter. It applies at follow-up visits, once treatment of a thumb extensor injury is already under way. Two words in that descriptor do most of the [&hellip;]<\/p>\n","protected":false},"author":83,"featured_media":180606,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_linkdex":"86","_yoast_wpseo_content_score":"30","_yoast_wpseo_is_cornerstone":"","_yoast_wpseo_keywordsynonyms":"[\"\",\"\",\"\",\"\"]","_yoast_wpseo_focuskw_text_input":"","_seo_original_html":"","footnotes":""},"categories":[1549,1550],"tags":[2972,1680,1363,1666,1594],"class_list":["post-180609","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-diagnostic-codes","category-icd-10-cm","tag-clinical-coding","tag-diagnostic-codes","tag-icd-10","tag-orthopedic-billing","tag-physical-therapy"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.2 (Yoast SEO v28.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>ICD-10 Code S66.299D: Thumb extensor injury, not finger<\/title>\n<meta name=\"description\" content=\"S66.299D covers a thumb extensor injury at a follow-up visit. A finger takes S66.399D, and a documented side takes S66.291D.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-s66299d\/\" \/>\n<meta property=\"og:locale\" content=\"nl_NL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ICD-10 Code S66.299D: Thumb extensor injury, not finger\" \/>\n<meta property=\"og:description\" content=\"S66.299D covers a thumb extensor injury at a follow-up visit. A finger takes S66.399D, and a documented side takes S66.291D.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-s66299d\/\" \/>\n<meta property=\"og:site_name\" content=\"Pabau\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Pabau\/\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-17T09:21:25+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-08-17T09:21:27+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/pabau.com\/wp-content\/uploads\/2026\/08\/icd-10-code-s66299d.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"630\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"Anja Dodevska\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@pabaucrm\" \/>\n<meta name=\"twitter:site\" content=\"@pabaucrm\" \/>\n<meta name=\"twitter:label1\" content=\"Geschreven door\" \/>\n\t<meta name=\"twitter:data1\" content=\"Anja Dodevska\" \/>\n\t<meta name=\"twitter:label2\" content=\"Geschatte leestijd\" \/>\n\t<meta name=\"twitter:data2\" content=\"15 minuten\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-s66299d\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-s66299d\\\/\"},\"author\":{\"name\":\"Anja Dodevska\",\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/#\\\/schema\\\/person\\\/f2e43b25ed02313e8781f0f4507398b9\"},\"headline\":\"ICD-10 Code S66.299D: Thumb extensor injury, subsequent encounter\",\"datePublished\":\"2026-08-17T09:21:25+00:00\",\"dateModified\":\"2026-08-17T09:21:27+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-s66299d\\\/\"},\"wordCount\":3155,\"publisher\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-s66299d\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/pabau.com\\\/wp-content\\\/uploads\\\/2026\\\/08\\\/icd-10-code-s66299d.webp\",\"keywords\":[\"Clinical Coding\",\"Diagnostic codes\",\"ICD-10\",\"Orthopedic Billing\",\"Physical Therapy\"],\"articleSection\":[\"Diagnostic Codes\",\"ICD-10-CM\"],\"inLanguage\":\"nl-NL\"},{\"@type\":[\"WebPage\",\"FAQPage\"],\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-s66299d\\\/\",\"url\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-s66299d\\\/\",\"name\":\"ICD-10 Code S66.299D: Thumb extensor injury, not finger\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-s66299d\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-s66299d\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/pabau.com\\\/wp-content\\\/uploads\\\/2026\\\/08\\\/icd-10-code-s66299d.webp\",\"datePublished\":\"2026-08-17T09:21:25+00:00\",\"dateModified\":\"2026-08-17T09:21:27+00:00\",\"description\":\"S66.299D covers a thumb extensor injury at a follow-up visit. 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It applies when a patient returns for ongoing treatment of a thumb extensor injury that is still healing. The note does not record which thumb was injured.\",\"inLanguage\":\"nl-NL\"},\"inLanguage\":\"nl-NL\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-s66299d\\\/#faq-question-1786714452032\",\"position\":2,\"url\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-s66299d\\\/#faq-question-1786714452032\",\"name\":\"Does S66.299D apply to the thumb or to a finger?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"S66.299D applies to the thumb only. Its parent subcategory, S66.2, covers injury of the extensor muscle, fascia and tendon of the thumb at wrist and hand level. Extensor injuries to the four fingers belong to S66.3, where the equivalent unspecified-digit subsequent-encounter code is S66.399D.\",\"inLanguage\":\"nl-NL\"},\"inLanguage\":\"nl-NL\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-s66299d\\\/#faq-question-1786714452033\",\"position\":3,\"url\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-s66299d\\\/#faq-question-1786714452033\",\"name\":\"What does unspecified mean in S66.299D?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It refers to laterality, not to the digit. The sixth character in the S66.29 series records the side. Use 1 for the right thumb, 2 for the left thumb, and 9 for an unspecified thumb. If the note names a side, use S66.291D or S66.292D instead.\",\"inLanguage\":\"nl-NL\"},\"inLanguage\":\"nl-NL\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-s66299d\\\/#faq-question-1786714452034\",\"position\":4,\"url\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-s66299d\\\/#faq-question-1786714452034\",\"name\":\"Is S66.299D a billable ICD-10-CM code?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. S66.299D is a billable, specific ICD-10-CM code valid for HIPAA-covered electronic transactions in the 2026 edition, effective October 1, 2025. It can be used on a claim without a further level of detail, and it is exempt from present-on-admission reporting.\",\"inLanguage\":\"nl-NL\"},\"inLanguage\":\"nl-NL\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-s66299d\\\/#faq-question-1786714452035\",\"position\":5,\"url\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-s66299d\\\/#faq-question-1786714452035\",\"name\":\"What is the difference between S66.299A and S66.299D?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"S66.299A is the initial encounter, meaning the first time the patient receives active treatment for this thumb extensor injury. S66.299D covers every follow-up visit while the injury is still in the active healing phase. The distinction rests on the treatment phase, not on how many visits have taken place.\",\"inLanguage\":\"nl-NL\"},\"inLanguage\":\"nl-NL\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-s66299d\\\/#faq-question-1786714452036\",\"position\":6,\"url\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-s66299d\\\/#faq-question-1786714452036\",\"name\":\"When should you use the seventh character D in ICD-10 injury coding?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Use D whenever the patient is receiving routine or ongoing active treatment for an injury established at an earlier encounter. Active treatment includes hand therapy, wound care, splinting, and rehabilitation. Switch to S for sequela only after the original injury has healed and a late effect remains.\",\"inLanguage\":\"nl-NL\"},\"inLanguage\":\"nl-NL\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-s66299d\\\/#faq-question-1786714452037\",\"position\":7,\"url\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-s66299d\\\/#faq-question-1786714452037\",\"name\":\"What documentation is required to bill S66.299D?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The note must record four things. First, an other specified injury of the thumb extensor muscle, fascia, or tendon. Second, that this is a subsequent visit for an injury already under treatment. Third, why the side is not documented. Fourth, what care was delivered at this encounter. 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She enjoys breaking down complex topics into clear, accessible content and has a soft spot for the often-overlooked aspects of clinic life. When she's not writing, she's exploring cafes, walking her dog, or spending time with friends and family.","url":"https:\/\/pabau.com\/nl\/blog\/author\/anja-dodevska\/"},{"@type":"Question","@id":"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-s66299d\/#faq-question-1786714452031","position":1,"url":"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-s66299d\/#faq-question-1786714452031","name":"What does ICD-10 Code S66.299D mean?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"S66.299D is a billable ICD-10-CM code. It covers other specified injury of extensor muscle, fascia and tendon of unspecified thumb at wrist and hand level, subsequent encounter. It applies when a patient returns for ongoing treatment of a thumb extensor injury that is still healing. The note does not record which thumb was injured.","inLanguage":"nl-NL"},"inLanguage":"nl-NL"},{"@type":"Question","@id":"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-s66299d\/#faq-question-1786714452032","position":2,"url":"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-s66299d\/#faq-question-1786714452032","name":"Does S66.299D apply to the thumb or to a finger?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"S66.299D applies to the thumb only. Its parent subcategory, S66.2, covers injury of the extensor muscle, fascia and tendon of the thumb at wrist and hand level. Extensor injuries to the four fingers belong to S66.3, where the equivalent unspecified-digit subsequent-encounter code is S66.399D.","inLanguage":"nl-NL"},"inLanguage":"nl-NL"},{"@type":"Question","@id":"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-s66299d\/#faq-question-1786714452033","position":3,"url":"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-s66299d\/#faq-question-1786714452033","name":"What does unspecified mean in S66.299D?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"It refers to laterality, not to the digit. The sixth character in the S66.29 series records the side. Use 1 for the right thumb, 2 for the left thumb, and 9 for an unspecified thumb. If the note names a side, use S66.291D or S66.292D instead.","inLanguage":"nl-NL"},"inLanguage":"nl-NL"},{"@type":"Question","@id":"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-s66299d\/#faq-question-1786714452034","position":4,"url":"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-s66299d\/#faq-question-1786714452034","name":"Is S66.299D a billable ICD-10-CM code?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Yes. S66.299D is a billable, specific ICD-10-CM code valid for HIPAA-covered electronic transactions in the 2026 edition, effective October 1, 2025. It can be used on a claim without a further level of detail, and it is exempt from present-on-admission reporting.","inLanguage":"nl-NL"},"inLanguage":"nl-NL"},{"@type":"Question","@id":"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-s66299d\/#faq-question-1786714452035","position":5,"url":"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-s66299d\/#faq-question-1786714452035","name":"What is the difference between S66.299A and S66.299D?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"S66.299A is the initial encounter, meaning the first time the patient receives active treatment for this thumb extensor injury. S66.299D covers every follow-up visit while the injury is still in the active healing phase. The distinction rests on the treatment phase, not on how many visits have taken place.","inLanguage":"nl-NL"},"inLanguage":"nl-NL"},{"@type":"Question","@id":"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-s66299d\/#faq-question-1786714452036","position":6,"url":"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-s66299d\/#faq-question-1786714452036","name":"When should you use the seventh character D in ICD-10 injury coding?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Use D whenever the patient is receiving routine or ongoing active treatment for an injury established at an earlier encounter. Active treatment includes hand therapy, wound care, splinting, and rehabilitation. Switch to S for sequela only after the original injury has healed and a late effect remains.","inLanguage":"nl-NL"},"inLanguage":"nl-NL"},{"@type":"Question","@id":"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-s66299d\/#faq-question-1786714452037","position":7,"url":"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-s66299d\/#faq-question-1786714452037","name":"What documentation is required to bill S66.299D?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"The note must record four things. First, an other specified injury of the thumb extensor muscle, fascia, or tendon. Second, that this is a subsequent visit for an injury already under treatment. Third, why the side is not documented. Fourth, what care was delivered at this encounter. Individual payer coverage determinations may add requirements.","inLanguage":"nl-NL"},"inLanguage":"nl-NL"},{"@type":"Question","@id":"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-s66299d\/#faq-question-1786714452038","position":8,"url":"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-s66299d\/#faq-question-1786714452038","name":"What is the difference between S66.299D and S66.299S?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"S66.299D means the patient is in active treatment and the thumb injury is still healing. S66.299S means the injury has healed but left a late effect, such as a persistent extension deficit or restrictive scar tissue. Do not use S66.299S while the original injury is still being actively managed.","inLanguage":"nl-NL"},"inLanguage":"nl-NL"}]}},"yoast":{"focus_keyword":"ICD-10 Code S66.299D","seo_title":"ICD-10 Code S66.299D: Thumb extensor injury, not finger","meta_description":"S66.299D covers a thumb extensor injury at a follow-up visit. A finger takes S66.399D, and a documented side takes S66.291D.","content_score":"30","is_cornerstone":"","related_keyphrases":[{"keyword":"subsequent encounter ICD-10 seventh character","score":56},{"keyword":"extensor tendon injury wrist ICD-10","score":61},{"keyword":"S66 ICD-10 code category","score":56}]},"_links":{"self":[{"href":"https:\/\/pabau.com\/nl\/wp-json\/wp\/v2\/posts\/180609","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pabau.com\/nl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pabau.com\/nl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pabau.com\/nl\/wp-json\/wp\/v2\/users\/83"}],"replies":[{"embeddable":true,"href":"https:\/\/pabau.com\/nl\/wp-json\/wp\/v2\/comments?post=180609"}],"version-history":[{"count":4,"href":"https:\/\/pabau.com\/nl\/wp-json\/wp\/v2\/posts\/180609\/revisions"}],"predecessor-version":[{"id":181218,"href":"https:\/\/pabau.com\/nl\/wp-json\/wp\/v2\/posts\/180609\/revisions\/181218"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pabau.com\/nl\/wp-json\/wp\/v2\/media\/180606"}],"wp:attachment":[{"href":"https:\/\/pabau.com\/nl\/wp-json\/wp\/v2\/media?parent=180609"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pabau.com\/nl\/wp-json\/wp\/v2\/categories?post=180609"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pabau.com\/nl\/wp-json\/wp\/v2\/tags?post=180609"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}