{"id":159086,"date":"2026-07-20T10:12:28","date_gmt":"2026-07-20T10:12:28","guid":{"rendered":"https:\/\/pabau.com\/?p=159086"},"modified":"2026-08-13T12:10:34","modified_gmt":"2026-08-13T12:10:34","slug":"cpt-code-90999","status":"publish","type":"post","link":"https:\/\/pabau.com\/es\/procedure-codes\/cpt-code-90999\/","title":{"rendered":"CPT Code 90999: Unlisted Dialysis Procedure Billing Guide"},"content":{"rendered":"\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"MedicalWebPage\",\"headline\":\"CPT Code 90999: Unlisted Dialysis Procedure Billing Guide\",\"description\":\"CPT Code 90999 covers unlisted dialysis procedures including hemodialysis and peritoneal dialysis. Learn documentation requirements, Medicare reimbursement, ICD-10 crosswalk, and related codes.\",\"url\":\"https:\/\/pabau.com\/procedure-codes\/cpt-code-90999\/\",\"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\":\"2026-07-20\",\"dateModified\":\"2026-07-20\"}<\/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>CPT Code 90999 is the unlisted dialysis procedure code used when no specific hemodialysis or peritoneal dialysis code adequately describes the service rendered.<\/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>Medicare has no fixed fee schedule rate for 90999. Reimbursement is determined case-by-case by the MAC or commercial payer, requiring full supporting documentation.<\/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>Always exhaust specific dialysis codes (90935, 90945, 90951-90966) before billing 90999. Unlisted codes carry a higher denial risk without a detailed operative note and medical necessity statement.<\/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 helps nephrology and dialysis practices track unlisted procedure submissions, attach documentation, and manage payer-specific requirements across locations.<\/p>\n                        <\/div>\n                                                <\/div>\n        <\/div>\n    \n\n\n<p class=\"wp-block-paragraph\"><strong>CPT Code 90999<\/strong> is the unlisted dialysis procedure code, billed for hemodialysis or peritoneal dialysis when no other code in the 90935-90999 range accurately describes the service performed. Per the <a href=\"https:\/\/www.ama-assn.org\/practice-management\/cpt\/cpt-code-set-overview\" target=\"_blank\" rel=\"nofollow noopener\">AMA&#8217;s CPT code set<\/a>, the official descriptor reads: <em>\u00abUnlisted dialysis procedure, inpatient or outpatient.\u00bb<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It&#8217;s a last-resort code, reserved for situations with no matching specific code. The <a href=\"https:\/\/www.aapc.com\/codes\/cpt-codes-range\/\" target=\"_blank\" rel=\"nofollow noopener\">AAPC&#8217;s CPT code lookup<\/a> classifies 90999 under the Medicine section, Dialysis subsection, alongside its specific-code counterparts.<\/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=\"CPT Coding Pitfalls Every Medical Practice Faces\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/vbvV5okdXKg?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-when-to-use-cpt-code-90999\" class=\"wp-block-heading\">When to use CPT Code 90999<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The AMA is explicit: unlisted codes apply only when no existing specific code adequately describes the service. For dialysis practices, this typically means one of several scenarios.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Novel dialysis techniques:<\/strong> A patient receives a hybrid or experimental dialysis modality not covered by codes 90935-90947 or the ESRD monthly capitation series. Emerging techniques like sustained low-efficiency dialysis (SLED) delivered in an atypical configuration may warrant 90999 when no specific code applies.<\/li>\n\n\n\n<li><strong>Atypical peritoneal dialysis variations:<\/strong> Standard peritoneal dialysis procedures map to 90945 (single evaluation) and 90947 (repeat). When a PD procedure is performed with an unusual access approach or combined intervention that falls outside those descriptors, 90999 becomes the appropriate fallback.<\/li>\n\n\n\n<li><strong>Investigational services:<\/strong> Dialysis-adjacent services provided under an approved clinical trial that do not correspond to any specific listed code.<\/li>\n\n\n\n<li><strong>Imprecise code matches:<\/strong> In rare cases, an existing code&#8217;s descriptor is close but not precise enough to accurately represent the service rendered. Per AMA CPT guidelines, the code reported must accurately describe the procedure performed rather than merely approximating it.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The critical rule: exhaust all specific codes first. A biller who reaches for 90999 without first reviewing the full 90935-90970 range risks both denials and compliance exposure. Using practice management software features that flag unlisted code usage can help practices audit their 90999 frequency and catch cases where a specific code was available.<\/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\">Field<\/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\">Details<\/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\">CPT Code<\/td>\n<td style=\"padding:12px 16px;color:#374151\">90999<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Official Descriptor<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Unlisted dialysis procedure, inpatient or outpatient<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">CPT Section<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Medicine &#8211; Dialysis (90935-90999)<\/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 Type<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Unlisted procedure code<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Applicable Settings<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Inpatient and outpatient<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Procedures Covered<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Hemodialysis and peritoneal dialysis (when no specific code applies)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Medicare Fee Schedule<\/td>\n<td style=\"padding:12px 16px;color:#374151\">No fixed rate; case-by-case MAC determination<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<h2 id=\"h-documentation-requirements-for-cpt-90999\" class=\"wp-block-heading\">Documentation requirements for CPT 90999<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Unlisted codes are where claims go to die without proper documentation. Payers have no fee schedule benchmark and no automatic processing pathway for 90999, so every submission triggers manual review. That review succeeds or fails on what you attach.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Maintaining patient data security tools that preserve audit-ready records is part of good dialysis billing hygiene. Beyond security, the following documentation elements are required for virtually all payers when submitting CPT Code 90999.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Operative or procedure note:<\/strong> A detailed narrative describing exactly what was performed, why the existing specific codes were insufficient, and the clinical context. This is the single most important document in an unlisted code submission.<\/li>\n\n\n\n<li><strong>Medical necessity statement:<\/strong> A signed attestation from the treating physician explaining why the service was medically necessary for this patient at this time.<\/li>\n\n\n\n<li><strong>Comparison to the most similar listed code:<\/strong> AMA guidelines require providers to identify the CPT code that most closely approximates the service and explain why it does not fully apply. Many payers use this comparison to benchmark their reimbursement decision.<\/li>\n\n\n\n<li><strong>Supporting clinical records:<\/strong> Relevant lab values, patient history, prior authorization correspondence, and any clinical trial documentation if applicable.<\/li>\n\n\n\n<li><strong>Prior authorization (where required):<\/strong> Some commercial payers require pre-authorization before any unlisted code can be billed. Check payer-specific policies before the service is rendered, not after.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Using digital intake forms that capture procedure specifics at the point of care makes assembling this documentation package significantly faster. <\/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\/billing_codes\/cpt-code-90999\/customizable-consent-and-intake-forms.webp\" alt=\"Customizable consent and intake forms\"\/><figcaption class=\"wp-element-caption\"><em>Customizable consent and intake forms<\/em><\/figcaption><\/figure>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\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>Before submitting CPT Code 90999, attach the operative note AND a written comparison to the closest specific code. Write one sentence explaining why the specific code does not fully describe the service. Payers that use this comparison as their benchmark will process the claim faster and with less back-and-forth.<\/p>\n            <\/div>\n        <\/div>\n    \n\n\n<h2 id=\"h-medicare-reimbursement-for-cpt-90999\" class=\"wp-block-heading\">Medicare reimbursement for CPT 90999<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Medicare does not assign a fixed fee schedule rate to CPT Code 90999. According to the <a href=\"https:\/\/www.cms.gov\/medicare\/physician-fee-schedule\/search\/overview\" target=\"_blank\" rel=\"nofollow noopener\">CMS fee schedule lookup<\/a>, unlisted codes have no assigned Relative Value Units (RVUs), which means there is no automatic payment calculation. Reimbursement is determined on a case-by-case basis by the relevant Medicare Administrative Contractor (MAC).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The ESRD context adds another layer. Most dialysis services for ESRD patients fall under the ESRD Prospective Payment System (ESRD PPS), a bundled payment model that covers a defined set of routine dialysis services. Whether 90999 falls inside or outside that bundle depends on the specific service rendered.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CMS guidance and the applicable MAC&#8217;s Local Coverage Determination (LCD) should be consulted before billing. Don&#8217;t make blanket inclusion or exclusion assumptions without reviewing the current-year CMS ESRD PPS final rule.<\/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\">Payer Type<\/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\">Reimbursement Approach<\/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\">Key Requirement<\/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\">Medicare (MAC)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Case-by-case; no fixed RVU<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Operative note, medical necessity, comparison to closest code<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Medicaid (state)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Varies by state program<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Contact state Medicaid program; may mirror Medicare policy<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Commercial (e.g. Molina)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Payer-specific; may include weekly\/monthly frequency limits<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Check plan-specific policy; prior authorization often required<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">ESRD PPS Bundle<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Inclusion\/exclusion depends on specific service<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Consult CMS ESRD PPS final rule and applicable MAC LCD<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">Commercial payers have their own frequency limits. Molina Healthcare, for example, has published specific weekly and monthly usage limits for ESRD-related 90999 submissions. These limits show how commercial payers manage unlisted code exposure, not universal rules across the industry. Providers should still verify current policy directly with each payer before billing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Understanding HIPAA-compliant documentation practices for claim submissions matters here too, since incomplete or improperly transmitted records are a common denial trigger for unlisted codes.<\/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                    Manage dialysis billing from one platform                <\/h3>\n\n                <p class=\"description\">\n                    Pabau helps nephrology practices track unlisted procedure submissions, attach documentation packages, and manage payer-specific requirements without chasing paperwork across multiple systems.                <\/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 practice management platform for nephrology billing\"\n                    loading=\"lazy\"\n                \/>\n            <\/div>\n        <\/div>\n        \n\n\n<p class=\"wp-block-paragraph\">A <a href=\"https:\/\/pabau.com\/industry\/gp-clinic-software\/\">GP practice platform<\/a> keeps these high-volume services charted, coded, and billed from one screen.<\/p>\n\n\n\n<h2 id=\"h-icd-10-codes-commonly-used-with-cpt-90999\" class=\"wp-block-heading\">ICD-10 codes commonly used with CPT 90999<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Every CPT Code 90999 claim requires a supporting diagnosis code. The ICD-10-CM codes below represent the diagnoses most frequently paired with unlisted dialysis procedures in nephrology billing. Use the <a href=\"https:\/\/crosscoder.com\/\" target=\"_blank\" rel=\"nofollow noopener\">CrossCoder crosswalk tool<\/a> and verify against the current-year code set before submitting. Codes may be added, revised, or retired annually.<\/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\">ICD-10-CM 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\">Dialysis Relevance<\/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\">N18.6<\/td>\n<td style=\"padding:12px 16px;color:#374151\">End-stage renal disease (ESRD)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Primary diagnosis for most dialysis patients; pairs with most dialysis CPT codes<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">N18.5<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Chronic kidney disease, stage 5<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Common in metabolic health practices managing pre-ESRD CKD patients; verify status with the treating provider<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Z99.2<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Dependence on renal dialysis<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Secondary diagnosis confirming ongoing dialysis dependence<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">N17.9<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Acute kidney failure, unspecified<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Acute dialysis scenarios; may trigger unlisted code when atypical modality used<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">T82.49XA<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Other complication of vascular dialysis catheter, initial encounter<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Complication-related dialysis service; may not map to a specific procedure code<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">N19<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Unspecified kidney failure<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Use with caution; specificity improves claim acceptance rates<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">Linking the correct diagnosis code to the procedure code is non-negotiable. An N18.6 paired with CPT Code 90999 and a detailed operative note gives the MAC a clear clinical picture. A vague N19 without supporting documentation is the fastest route to a denial.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Using claims management software that validates code pairings before submission catches these mismatches before they reach the payer.<\/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\/billing_codes\/cpt-code-90999\/automate-claims-through-healthcode.webp\" alt=\"Automate claims and billing with Pabau\"\/><figcaption class=\"wp-element-caption\"><em>Automate claims and billing with Pabau<\/em><\/figcaption><\/figure>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 id=\"h-applicable-modifiers-for-cpt-90999\" class=\"wp-block-heading\">Applicable modifiers for CPT 90999<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Modifiers clarify the circumstances of a service and can protect against inappropriate denials or reductions. For CPT Code 90999, the following modifiers are most commonly applicable.<\/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\">Modifier<\/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 With 90999<\/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\">52<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Reduced services<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Service was partially performed or discontinued; reduces expected reimbursement<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">22<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Increased procedural services<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Service required substantially more physician work than typically associated; requires supporting documentation<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">GY<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Item or service statutorily excluded from Medicare<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Used when billing Medicare for a non-covered service; needed for denial on file for secondary payer claims<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">GZ<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Item or service expected to be denied as not reasonable and necessary<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Used when provider believes Medicare may deny the claim; waives beneficiary liability<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">59<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Distinct procedural service<\/td>\n<td style=\"padding:12px 16px;color:#374151\">90999 is a separate and distinct procedure from another service billed on the same date<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">Modifier selection for unlisted codes requires clinical judgment. Appending modifier 22 without a letter of medical necessity explaining the increased work is a common audit trigger. Review your MAC&#8217;s modifier policy before submitting. Using compliance management tools that flag high-risk modifier combinations reduces audit exposure for nephrology practices.<\/p>\n\n\n\n<h2 id=\"h-related-dialysis-cpt-codes\" class=\"wp-block-heading\">Related dialysis CPT codes<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Before billing CPT Code 90999, confirm that none of the specific dialysis codes below apply. Each has a defined descriptor. The difference between 90999 and the right specific code is the difference between a fast payment and a lengthy review cycle.<\/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\">CPT 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\">Key Distinction from 90999<\/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\">90935<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Hemodialysis procedure with single physician evaluation<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Standard HD with one evaluation; use this before reaching for 90999<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">90937<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Hemodialysis procedure requiring repeated evaluation(s)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">HD with multiple evaluations on the same day<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">90945<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Dialysis procedure other than hemodialysis with single physician evaluation<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Covers peritoneal dialysis with one evaluation; often covers PD scenarios before 90999 applies<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">90947<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Dialysis procedure other than hemodialysis requiring repeated evaluation(s)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">PD or hemofiltration with multiple evaluations<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">90960<\/td>\n<td style=\"padding:12px 16px;color:#374151\">ESRD-related services, monthly capitation payment, patient 20 years and older, 4 or more visits per month<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Monthly capitation for ESRD management; covers routine dialysis oversight, not individual procedures<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">90961<\/td>\n<td style=\"padding:12px 16px;color:#374151\">ESRD-related services, monthly capitation, patient 20 years and older, 2-3 visits per month<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Same as 90960 with reduced visit frequency<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">90999<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Unlisted dialysis procedure, inpatient or outpatient<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Use ONLY when no other code in this table adequately describes the service<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">The line between 90935 and 90999 is clear-cut. If a hemodialysis procedure with a single physician evaluation was performed, 90935 is the correct code. Using 90999 in that scenario is a coding error that creates audit risk. Tracking how your billing team applies these codes over time is part of solid EHR integration for billing.<\/p>\n\n\n\n<h2 id=\"h-cpt-90999-vs-specific-dialysis-codes-decision-framework\" class=\"wp-block-heading\">CPT 90999 vs specific dialysis codes: Decision framework<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">No competitor reference page fully addresses this as a standalone decision tool. Here is a structured framework for making the 90999-vs-specific-code choice before any claim is submitted.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Identify the modality.<\/strong> Was this hemodialysis, peritoneal dialysis, or another modality (hemofiltration, SLED, etc.)? Hemodialysis maps first to 90935 or 90937. Peritoneal or other non-HD dialysis maps first to 90945 or 90947.<\/li>\n\n\n\n<li><strong>Check evaluation count.<\/strong> Was there one physician evaluation or multiple? Single evaluation = single-visit code (90935, 90945). Multiple evaluations = repeat code (90937, 90947).<\/li>\n\n\n\n<li><strong>Review ESRD monthly capitation context.<\/strong> Is this claim for a monthly capitation payment for an ESRD patient? If yes, review 90951-90966 before considering 90999. These codes cover different age groups and visit frequencies.<\/li>\n\n\n\n<li><strong>Confirm no existing code fits.<\/strong> If steps 1-3 produce no viable code, document why each candidate code was rejected. This narrative becomes part of your 90999 submission package.<\/li>\n\n\n\n<li><strong>Build the documentation package.<\/strong> Attach the operative note, medical necessity statement, comparison to closest code, and any prior authorization confirmation.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Running this five-step check through a standardized internal workflow, rather than relying on individual coder judgment each time, reduces the inconsistency that leads to audit findings. Pabau&#8217;s medical practice billing workflow resources cover how to build these internal checks into daily operations.<\/p>\n\n\n\n<h2 id=\"h-common-billing-errors-with-cpt-90999\" class=\"wp-block-heading\">Common billing errors with CPT 90999<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Unlisted codes have a higher denial rate than specific codes precisely because they require human review. Most denials are preventable. These are the errors that cause them most often.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Using 90999 when a specific code exists:<\/strong> The most common error. A coder who isn&#8217;t familiar with 90935-90947 reaches for 90999 as a catch-all. This triggers an immediate review and often a denial once the payer identifies the applicable specific code.<\/li>\n\n\n\n<li><strong>Submitting without a comparison code reference:<\/strong> AMA guidelines require identifying the closest existing code and explaining why it doesn&#8217;t apply. Claims missing this comparison are routinely denied or pended for additional information.<\/li>\n\n\n\n<li><strong>Missing the operative note:<\/strong> A medical necessity statement alone is insufficient. The payer needs the procedural narrative. Missing operative notes cause the single largest category of 90999 denials.<\/li>\n\n\n\n<li><strong>Ignoring payer-specific frequency limits:<\/strong> Commercial payers like Molina Healthcare publish specific frequency limits for 90999. Submitting beyond those limits without prior authorization results in automatic denial.<\/li>\n\n\n\n<li><strong>Incorrect modifier use:<\/strong> Appending modifier 22 without a supporting letter of medical necessity is a common audit flag. Appending GZ on a claim the provider believes is covered is also a coding error.<\/li>\n\n\n\n<li><strong>Vague ICD-10 pairing:<\/strong> Using N19 (unspecified kidney failure) instead of N18.6 (ESRD) or N17.9 (acute kidney failure) reduces the clinical specificity that payers use to assess medical necessity.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Practices with high 90999 volume should run a quarterly audit: pull all 90999 claims from the period, verify each one against the decision framework above, and flag any where a specific code could have applied. Incorporating medical practice management software that tracks denial patterns by code helps identify systemic errors before they compound.<\/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>Run a quarterly report filtering all CPT 90999 submissions from the previous 90 days. For each claim, verify the operative note is attached and the comparison code was documented. If a specific dialysis code would have applied, flag that case for coder education. Three to five hours of quarterly review prevents months of appeal work.<\/p>\n            <\/div>\n        <\/div>\n    \n\n\n<h2 id=\"h-how-pabau-supports-dialysis-billing-and-cpt-code-management\" class=\"wp-block-heading\">How Pabau supports dialysis billing and CPT code management<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Nephrology and dialysis practices. Unlisted codes like CPT Code 90999 make that complexity worse because they require manual review at every payer.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pabau&#8217;s claims management software gives billing teams a single place to track submissions, attach supporting documentation, and monitor payer-specific requirements across multiple locations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Beyond claims management, practices use Pabau to maintain billing workflow structures that reduce the chance of an unlisted code submission going out incomplete. Clinical notes, consent records, and prior authorization confirmations are stored alongside the patient record, so nothing is missing when the biller builds the 90999 documentation package.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For practices managing ESRD patients across multiple sites.<\/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\/billing_codes\/cpt-code-90999\/multi-location-management.webp\" alt=\"Multi location management\"\/><figcaption class=\"wp-element-caption\"><em>Multi location management<\/em><\/figcaption><\/figure>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 id=\"h-fee-schedule-and-reimbursement-rates-for-cpt-90999-in-2026\" class=\"wp-block-heading\">Fee schedule and reimbursement rates for CPT 90999 in 2026<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Because CPT Code 90999 has no fixed RVU assignment, there is no published Medicare fee schedule rate to report. Reimbursement is negotiated or determined individually by each payer.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For commercial payer rates, use the <a href=\"https:\/\/fastrvu.com\/tools\/rvu-lookup\" target=\"_blank\" rel=\"nofollow noopener\">FastRVU 2026 RVU lookup<\/a> to check whether your MAC has assigned any comparable RVU value, and to benchmark the closest specific code as a reimbursement reference point.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Facility vs. non-facility rate distinctions matter. For most dialysis procedures, the setting affects the total reimbursement. When 90999 is submitted for an inpatient encounter, the facility component is typically billed separately by the hospital. In an outpatient or independent dialysis center setting, the non-facility rate (which includes practice expense) is the applicable framework. Confirm this with your MAC before billing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">What&#8217;s consistent across all payer types: documentation quality is the only lever providers control. The better the operative note and medical necessity package, the stronger the reimbursement outcome. Practices that treat 90999 submissions like any other routine code, without the additional documentation package, will consistently underperform on reimbursement for these claims.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Related CPT codes<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pabau.com\/procedure-codes\/cpt-code-93356\/\">CPT code 93356 \u2014 Myocardial Strain Imaging<\/a><\/li>\n\n\n<li><a href=\"https:\/\/pabau.com\/procedure-codes\/cpt-code-91010\/\">CPT code 91010 \u2014 Esophageal Motility Study<\/a><\/li>\n\n\n<li><a href=\"https:\/\/pabau.com\/procedure-codes\/cpt-code-91065\/\">CPT code 91065 \u2014 Hydrogen breath test<\/a><\/li>\n\n\n<li><a href=\"https:\/\/pabau.com\/procedure-codes\/cpt-code-91200\/\">CPT Code 91200 \u2014 Liver elastography<\/a><\/li>\n<\/ul>\n\n\n\n<h2 id=\"h-conclusion\" class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">CPT Code 90999 exists for a narrow purpose: billing a dialysis service when no specific code applies. Using it correctly carries little risk. The risk comes from using it carelessly, without the documentation package unlisted codes require, or in place of a specific code that would have applied.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For nephrology practices that bill 90999 regularly, Pabau&#8217;s claims management and documentation tools reduce the manual overhead of building compliant unlisted code submissions. To see how the platform handles complex billing workflows across dialysis and other specialties, <a href=\"https:\/\/pabau.com\/book-demo\/\">book a demo<\/a>.<\/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>Managing billing for chronic-care referrals?<\/strong> HCPCS code <a href=\"https:\/\/pabau.com\/procedure-codes\/hcpcs-code-g0180\/\">G0180<\/a> covers physician certification for home health episodes, a similar case-by-case documentation model to unlisted dialysis claims.<\/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>Pairing diagnosis and procedure codes correctly?<\/strong> ICD-10 code <a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-m539\/\">M53.9<\/a> shows how an unspecified diagnosis code creates the same denial risk as a vague dialysis pairing.<\/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 for other chronic-condition supplies?<\/strong> HCPCS code <a href=\"https:\/\/pabau.com\/procedure-codes\/hcpcs-code-a4427\/\">A4427<\/a> covers ostomy pouch billing, another area where documentation specificity drives reimbursement.<\/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-1784537588813\"><h3 class=\"schema-faq-question\">What is CPT Code 90999?<\/h3> <p class=\"schema-faq-answer\">CPT Code 90999 is an unlisted dialysis procedure code covering both hemodialysis and peritoneal dialysis when no other specific CPT code in the 90935-90970 range adequately describes the service rendered. It is a last-resort code maintained by the AMA and requires detailed documentation for reimbursement.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1784537588814\"><h3 class=\"schema-faq-question\">When should I use CPT 90999 instead of a specific dialysis code?<\/h3> <p class=\"schema-faq-answer\">Use CPT 90999 only after confirming that no specific code (90935, 90937, 90945, 90947, or the 90951-90966 ESRD capitation series) accurately describes the service. If a specific code exists for the modality and evaluation count, use that code. Unlisted codes are appropriate for novel modalities, atypical configurations, or investigational services with no specific code match.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1784537588815\"><h3 class=\"schema-faq-question\">Does Medicare reimburse CPT Code 90999?<\/h3> <p class=\"schema-faq-answer\">Medicare does not have a fixed fee schedule rate for CPT 90999. Reimbursement is determined case-by-case by the applicable Medicare Administrative Contractor (MAC). Providers must submit a complete documentation package including an operative note, medical necessity statement, and comparison to the closest specific code. Contact your regional MAC for jurisdiction-specific guidance.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1784537588816\"><h3 class=\"schema-faq-question\">What documentation is required for CPT Code 90999?<\/h3> <p class=\"schema-faq-answer\">Required documentation includes an operative or procedure note describing the service in detail, a medical necessity statement, identification of the closest existing CPT code and a written explanation of why it does not apply, supporting clinical records, and prior authorization confirmation where the payer requires it. Missing any of these elements is the leading cause of unlisted code denials.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1784537588817\"><h3 class=\"schema-faq-question\">What modifiers can be used with CPT Code 90999?<\/h3> <p class=\"schema-faq-answer\">Commonly applicable modifiers include 52 (reduced services), 22 (increased procedural services, requires additional documentation), GY (statutorily excluded from Medicare), GZ (expected denial, waives beneficiary liability), and 59 (distinct procedural service). Modifier selection depends on the specific clinical and billing circumstances; verify against your MAC&#8217;s modifier policy before submission.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1784537588818\"><h3 class=\"schema-faq-question\">What are the most common billing errors with CPT 90999?<\/h3> <p class=\"schema-faq-answer\">The most common errors are using 90999 when a specific dialysis code was available, submitting without an operative note, failing to identify the closest specific code in the claim package, ignoring payer-specific frequency limits, and pairing 90999 with a non-specific ICD-10 code like N19 instead of the more specific N18.6 (ESRD) or N17.9 (acute kidney failure).<\/p> <\/div> <\/div>\n\n\n","protected":false},"excerpt":{"rendered":"<p>CPT Code 90999 is the unlisted dialysis procedure code, billed for hemodialysis or peritoneal dialysis when no other code in the 90935-90999 range accurately describes the service performed. Per the AMA&#8217;s CPT code set, the official descriptor reads: \u00abUnlisted dialysis procedure, inpatient or outpatient.\u00bb It&#8217;s a last-resort code, reserved for situations with no matching specific [&hellip;]<\/p>\n","protected":false},"author":77,"featured_media":159085,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_linkdex":"88","_yoast_wpseo_content_score":"30","_yoast_wpseo_is_cornerstone":"","_yoast_wpseo_keywordsynonyms":"[\"\",\"\",\"\",\"\"]","_yoast_wpseo_focuskw_text_input":"","_seo_original_html":"","footnotes":""},"categories":[1433,1546],"tags":[1364,4126],"class_list":["post-159086","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-billing-codes","category-cpt-codes","tag-billing","tag-cpt"],"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>CPT Code 90999: Unlisted Dialysis Procedure Billing Guide<\/title>\n<meta name=\"description\" content=\"CPT Code 90999 applies only when no specific dialysis code fits. 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It combines scheduling, electronic health records, clinical forms, payments, marketing automation, reporting, and patient engagement tools into one secure cloud system to help practices streamline operations and grow their business.\",\"foundingDate\":\"2011-10-20\",\"numberOfEmployees\":{\"@type\":\"QuantitativeValue\",\"minValue\":\"201\",\"maxValue\":\"500\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/#\\\/schema\\\/person\\\/5de22f4ff3ec59b1925ef02dce956d7d\",\"name\":\"Katy Piper\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"es\",\"@id\":\"https:\\\/\\\/pabau.com\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/cropped-Snip20260306_177-96x96.png\",\"url\":\"https:\\\/\\\/pabau.com\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/cropped-Snip20260306_177-96x96.png\",\"contentUrl\":\"https:\\\/\\\/pabau.com\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/cropped-Snip20260306_177-96x96.png\",\"caption\":\"Katy Piper\"},\"description\":\"Katy Piper is a content writer covering aesthetics, dermatology, and clinic operations, with a knack for making clinical detail feel approachable. Outside of work, she's usually chasing her border collie around muddy fields or hunting down the best flat white in town.\",\"url\":\"https:\\\/\\\/pabau.com\\\/es\\\/blog\\\/author\\\/katy-piper\\\/\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/procedure-codes\\\/cpt-code-90999\\\/#faq-question-1784537588813\",\"position\":1,\"url\":\"https:\\\/\\\/pabau.com\\\/es\\\/procedure-codes\\\/cpt-code-90999\\\/#faq-question-1784537588813\",\"name\":\"What is CPT Code 90999?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"CPT Code 90999 is an unlisted dialysis procedure code covering both hemodialysis and peritoneal dialysis when no other specific CPT code in the 90935-90970 range adequately describes the service rendered. It is a last-resort code maintained by the AMA and requires detailed documentation for reimbursement.\",\"inLanguage\":\"es\"},\"inLanguage\":\"es\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/procedure-codes\\\/cpt-code-90999\\\/#faq-question-1784537588814\",\"position\":2,\"url\":\"https:\\\/\\\/pabau.com\\\/es\\\/procedure-codes\\\/cpt-code-90999\\\/#faq-question-1784537588814\",\"name\":\"When should I use CPT 90999 instead of a specific dialysis code?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Use CPT 90999 only after confirming that no specific code (90935, 90937, 90945, 90947, or the 90951-90966 ESRD capitation series) accurately describes the service. If a specific code exists for the modality and evaluation count, use that code. Unlisted codes are appropriate for novel modalities, atypical configurations, or investigational services with no specific code match.\",\"inLanguage\":\"es\"},\"inLanguage\":\"es\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/procedure-codes\\\/cpt-code-90999\\\/#faq-question-1784537588815\",\"position\":3,\"url\":\"https:\\\/\\\/pabau.com\\\/es\\\/procedure-codes\\\/cpt-code-90999\\\/#faq-question-1784537588815\",\"name\":\"Does Medicare reimburse CPT Code 90999?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Medicare does not have a fixed fee schedule rate for CPT 90999. Reimbursement is determined case-by-case by the applicable Medicare Administrative Contractor (MAC). Providers must submit a complete documentation package including an operative note, medical necessity statement, and comparison to the closest specific code. Contact your regional MAC for jurisdiction-specific guidance.\",\"inLanguage\":\"es\"},\"inLanguage\":\"es\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/procedure-codes\\\/cpt-code-90999\\\/#faq-question-1784537588816\",\"position\":4,\"url\":\"https:\\\/\\\/pabau.com\\\/es\\\/procedure-codes\\\/cpt-code-90999\\\/#faq-question-1784537588816\",\"name\":\"What documentation is required for CPT Code 90999?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Required documentation includes an operative or procedure note describing the service in detail, a medical necessity statement, identification of the closest existing CPT code and a written explanation of why it does not apply, supporting clinical records, and prior authorization confirmation where the payer requires it. 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It is a last-resort code maintained by the AMA and requires detailed documentation for reimbursement.","inLanguage":"es"},"inLanguage":"es"},{"@type":"Question","@id":"https:\/\/pabau.com\/es\/procedure-codes\/cpt-code-90999\/#faq-question-1784537588814","position":2,"url":"https:\/\/pabau.com\/es\/procedure-codes\/cpt-code-90999\/#faq-question-1784537588814","name":"When should I use CPT 90999 instead of a specific dialysis code?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Use CPT 90999 only after confirming that no specific code (90935, 90937, 90945, 90947, or the 90951-90966 ESRD capitation series) accurately describes the service. If a specific code exists for the modality and evaluation count, use that code. 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