{"id":157985,"date":"2026-07-17T09:43:22","date_gmt":"2026-07-17T09:43:22","guid":{"rendered":"https:\/\/pabau.com\/?p=157985"},"modified":"2026-08-18T12:41:18","modified_gmt":"2026-08-18T12:41:18","slug":"icd-10-code-t3185","status":"publish","type":"post","link":"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-t3185\/","title":{"rendered":"ICD-10 Code T31.85: Burns involving 80-89% body surface area"},"content":{"rendered":"\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"MedicalWebPage\",\"headline\":\"ICD-10 Code T31.85: Burns involving 80-89% of body surface with 50-59% third-degree burns\",\"description\":\"ICD-10 Code T31.85 (Burns involving 80-89% of body surface with 50-59% third-degree burns) is a billable FY2026 diagnosis code. Learn TBSA calculation, Rule of Nines, documentation requirements, and MS-DRG mapping.\",\"url\":\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-t3185\/\",\"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\":\"2026-07-07\",\"dateModified\":\"2026-07-17\"}<\/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>ICD-10 Code T31.85 describes burns involving 80-89% of total body surface area with 50-59% third-degree burns, billable for FY2026 (effective October 1, 2025).<\/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>T31.85 uses two coding axes: TBSA percentage (80-89%) calculated via the Rule of Nines, and the third-degree burn proportion (50-59%) documented by region.<\/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>Common coding error: selecting the wrong T31.8X sibling code because TBSA and third-degree percentages were not separately documented in the clinical record.<\/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>Pabau&#8217;s claims management software supports accurate burn code submissions with structured clinical documentation workflows for high-acuity cases.<\/p>\n                        <\/div>\n                                                <\/div>\n        <\/div>\n    \n\n\n<p class=\"wp-block-paragraph\">ICD-10 Code T31.85 describes burns involving 80-89% of total body surface area (TBSA) where 50-59% of the burned area is third-degree (full thickness). It&#8217;s a billable ICD-10-CM code, effective for FY2026, used when both the total burn extent and the depth of tissue damage need separate documentation for accurate MS-DRG assignment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This reference covers the official code description, billable status, the Rule of Nines methodology behind TBSA estimation, sibling code selection, documentation requirements, and FY2026 MS-DRG mapping for T31.85.<\/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-icd-10-code-t31-85-definition-billable-status-and-code-details\" class=\"wp-block-heading\">ICD-10 Code T31.85: Definition, billable status, and code details<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ICD-10 Code T31.85 is a billable\/specific ICD-10-CM diagnosis code valid for the submission of HIPAA-covered transactions. It is accepted on both CMS-1500 and UB-04 claim forms. The code became effective October 1, 2025 and is current for FY2026.<\/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\">Value<\/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\">T31.85<\/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\">Burns involving 80-89% of body surface with 50-59% third-degree burns<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Code system<\/td>\n<td style=\"padding:12px 16px;color:#374151\">ICD-10-CM (International Classification of Diseases, 10th Revision, Clinical Modification)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\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\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Effective date<\/td>\n<td style=\"padding:12px 16px;color:#374151\">October 1, 2025 (FY2026)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Claim form applicability<\/td>\n<td style=\"padding:12px 16px;color:#374151\">CMS-1500 and UB-04<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Parent category<\/td>\n<td style=\"padding:12px 16px;color:#374151\">T31 (Burns classified by extent of body surface involved)<\/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 hierarchy<\/td>\n<td style=\"padding:12px 16px;color:#374151\">T31 > T31.8 > T31.85<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Approximate synonyms<\/strong> accepted for ICD-10 Code T31.85 include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Burns of 80 to 89 percent of body surface with 50 to 59 percent third-degree burns<\/li>\n\n\n\n<li>Full thickness burns affecting 80-89% TBSA with 50-59% third degree<\/li>\n\n\n\n<li>Deep burns with greater than 80% body involvement with majority third-degree component<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">These synonyms may appear in physician documentation and should be mapped to T31.85 when TBSA and depth percentages match the coded ranges. Verify against the <a href=\"https:\/\/icd10cmtool.cdc.gov\/\" target=\"_blank\" rel=\"nofollow noopener\">CDC\/NCHS ICD-10-CM lookup<\/a> to confirm current FY2026 applicability.<\/p>\n\n\n\n<h2 id=\"h-understanding-the-t31-category-burns-classified-by-total-body-surface-area\" class=\"wp-block-heading\">Understanding the T31 category: Burns classified by total body surface area<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The T31 category classifies burns by the total body surface area involved, regardless of burn location on the body. This is the first axis of coding. The second axis is the proportion of that total that is third-degree (full thickness). T31.85 sits within the T31.8X subcategory, which covers cases where 80-89% TBSA is burned.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Coders frequently confuse T30, T31, and T32. Here is the distinction:<\/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\">Category<\/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\">What it classifies<\/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 distinguisher<\/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\">T30<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Burn of unspecified body region, unspecified degree<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Use only when region and degree cannot be 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\">T31<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Burns classified by extent of body surface involved (TBSA)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Caused by heat, flame, or contact; two-axis subcode structure<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">T32<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Corrosions classified by extent of body surface involved<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Caused by chemical agents, not heat or flame<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">T31 codes use a two-digit subcode structure. The first digit after the decimal indicates the TBSA range (e.g., &#8220;.8&#8221; = 80-89%). The second digit specifies what percentage of that TBSA is third-degree.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Accurate documentation of both percentages separately is required to reach the correct five-character code. Hospitals using claims management software can structure their coding workflows to capture both axes before submission.<\/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-t3185\/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-t31-8x-sibling-codes-burns-involving-80-89-of-body-surface\" class=\"wp-block-heading\">T31.8X sibling codes: Burns involving 80-89% of body surface<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ICD-10 Code T31.85 is one of ten sibling codes within the T31.8X subcategory. Each sibling differs only in the proportion of third-degree burns. Selecting the wrong sibling is the most common coding error for this subcategory.<\/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\">Third-degree burn proportion<\/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\">Billable<\/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\">T31.80<\/td>\n<td style=\"padding:12px 16px;color:#374151\">0-9% third-degree burns<\/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\">T31.81<\/td>\n<td style=\"padding:12px 16px;color:#374151\">10-19% third-degree burns<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Yes<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">T31.82<\/td>\n<td style=\"padding:12px 16px;color:#374151\">20-29% third-degree burns<\/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\">T31.83<\/td>\n<td style=\"padding:12px 16px;color:#374151\">30-39% third-degree burns<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Yes<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">T31.84<\/td>\n<td style=\"padding:12px 16px;color:#374151\">40-49% third-degree burns<\/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\"><strong>T31.85<\/strong><\/td>\n<td style=\"padding:12px 16px;color:#374151\"><strong>50-59% third-degree burns<\/strong><\/td>\n<td style=\"padding:12px 16px;color:#374151\"><strong>Yes<\/strong><\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">T31.86<\/td>\n<td style=\"padding:12px 16px;color:#374151\">60-69% third-degree burns<\/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\">T31.87<\/td>\n<td style=\"padding:12px 16px;color:#374151\">70-79% third-degree burns<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Yes<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">T31.88<\/td>\n<td style=\"padding:12px 16px;color:#374151\">80-89% third-degree burns<\/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\">T31.89<\/td>\n<td style=\"padding:12px 16px;color:#374151\">90% or more third-degree burns<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Yes<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">T31.85 sits at the midpoint of the T31.8X range: the majority of the burned area is third degree, but the full-thickness damage has not yet reached 60% of total TBSA. Physician documentation must clearly distinguish this from T31.84 (40-49%) or T31.86 (60-69%). Use the <a href=\"https:\/\/www.aapc.com\/codes\/icd-10-codes-range\/\" target=\"_blank\" rel=\"nofollow noopener\">AAPC Codify ICD-10-CM lookup<\/a> to cross-reference sibling codes before finalizing the claim.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tracking a complication from presentation to recall is far easier inside <a href=\"https:\/\/pabau.com\/blog\/patient-management-software\/\">a patient management system<\/a> than on paper.<\/p>\n\n\n\n<h2 id=\"h-the-rule-of-nines-how-tbsa-is-calculated-for-t31-coding\" class=\"wp-block-heading\">The Rule of Nines: How TBSA is calculated for T31 coding<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The Rule of Nines is the standard clinical method for estimating total body surface area affected by burns. It divides the adult body into regions, each assigned a percentage of the whole. Clinicians use this at the bedside to quantify burn extent, and coders use the documented percentage to select the correct T31 first-axis digit.<\/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\">Body region<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:center;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">TBSA %<\/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\">Head and neck<\/td>\n<td style=\"padding:12px 16px;text-align:center;color:#374151\">9%<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Each upper limb (arm)<\/td>\n<td style=\"padding:12px 16px;text-align:center;color:#374151\">9% (18% total)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Anterior trunk (chest\/abdomen)<\/td>\n<td style=\"padding:12px 16px;text-align:center;color:#374151\">18%<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Posterior trunk (back\/buttocks)<\/td>\n<td style=\"padding:12px 16px;text-align:center;color:#374151\">18%<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Each lower limb (leg)<\/td>\n<td style=\"padding:12px 16px;text-align:center;color:#374151\">18% (36% total)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Perineum\/genitalia<\/td>\n<td style=\"padding:12px 16px;text-align:center;color:#374151\">1%<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Total<\/td>\n<td style=\"padding:12px 16px;text-align:center;color:#374151\">100%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">For T31.85 to apply, the physician&#8217;s documentation must record a total of 80-89% TBSA burned. A patient with burns to both legs (36%), posterior trunk (18%), anterior trunk (18%), and both arms (18%) would reach 90% TBSA, pushing the code to T31.9X territory.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Small measurement differences shift the subcode entirely. Coders should query the physician when documented TBSA sits near a threshold boundary (e.g., exactly 80% or exactly 89%). Facilities using structured clinical record templates for burn documentation can reduce these queries significantly.<\/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-t3185\/comprehensive-emr-patient-record-management.webp\" alt=\"Comprehensive EMR &amp; patient record management\"\/><figcaption class=\"wp-element-caption\"><em>Comprehensive EMR &amp; patient record management<\/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>When TBSA documentation uses a range (e.g., &#8216;approximately 80-85%&#8217;), code to the lower bound of that range unless the physician clarifies the estimate. Query for specificity rather than assuming the higher end, as this affects both the T31 first-axis digit and potential MS-DRG assignment.<\/p>\n            <\/div>\n        <\/div>\n    \n\n\n<h2 id=\"h-coding-the-third-degree-burn-component-the-second-axis-in-t31-85\" class=\"wp-block-heading\">Coding the third-degree burn component: The second axis in T31.85<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The second digit of T31.85 (the &#8220;5&#8221;) encodes the proportion of the total burned area that is third-degree (full thickness). This is not a percentage of total body surface; it is a percentage of the burned area. For T31.85, 50-59% of the 80-89% TBSA burned is third-degree.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Third-degree burns destroy all layers of the dermis, producing a leathery, insensate wound. Documentation must specify burn depth by body region, not just an overall injury statement. Three common clinical descriptors map to third-degree coding:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Full thickness burn<\/li>\n\n\n\n<li>Third-degree burn<\/li>\n\n\n\n<li>Charring or eschar formation with loss of skin sensation<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Partial thickness burns (first or second degree) within the same injury do not count toward the third-degree percentage. The coder must calculate the third-degree subset separately, then express it as a proportion of total TBSA burned.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For a patient with 85% TBSA burned where 45% of that is full thickness, the third-degree proportion is 45\/85 = 52.9%, falling within the 50-59% range and confirming T31.85. Accurate capture of this calculation is supported by digital intake forms that prompt for depth documentation by region.<\/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-t3185\/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\n<h2 id=\"h-documentation-requirements-for-icd-10-code-t31-85\" class=\"wp-block-heading\">Documentation requirements for ICD-10 Code T31.85<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Insufficient documentation is the leading cause of claim denial for T31.85. Both coding axes must be explicitly supported in the medical record. Relying on a general burn injury note is not enough.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Required documentation elements for ICD-10 Code T31.85 include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Total TBSA percentage<\/strong>: physician-documented estimate (80-89%) using the Rule of Nines or Lund-Browder chart<\/li>\n\n\n\n<li><strong>Burn depth by region<\/strong>: identification of which body regions are third-degree vs. partial thickness<\/li>\n\n\n\n<li><strong>Third-degree subset percentage<\/strong>: calculation or explicit statement that 50-59% of the burned area is full thickness<\/li>\n\n\n\n<li><strong>Clinical estimation method<\/strong>: notation that Rule of Nines or an equivalent validated method was used<\/li>\n\n\n\n<li><strong>Cause of burn<\/strong>: thermal (heat\/flame) rather than chemical, to confirm T31 over T32<\/li>\n\n\n\n<li><strong>Date of injury<\/strong>: needed for sequencing when the admission spans multiple burn stages<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Hospitals managing burn unit documentation can cross-reference current coding guidance through the <a href=\"https:\/\/www.cms.gov\/medicare\/coding-billing\/icd-10-codes\" target=\"_blank\" rel=\"nofollow noopener\">CMS ICD-10 codes page<\/a>, which publishes FY2026 tabular list files and official coding guidelines. Practices using compliance management workflows can build documentation checklists directly into the clinical note template for burn admissions.<\/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-t3185\/hipaa-compliance-in-pabau.webp\" alt=\"HIPAA compliance in Pabau\"\/><figcaption class=\"wp-element-caption\"><em>HIPAA compliance in 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-icd-10-cm-2026-coding-guidelines-for-burn-codes\" class=\"wp-block-heading\">ICD-10-CM 2026 coding guidelines for burn codes<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The FY2026 ICD-10-CM Official Guidelines for Coding and Reporting govern how T31.85 is sequenced and applied. Key rules for burn coding in 2026:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Sequence among site codes<\/strong>: when multiple burns exist, the T20-T25 code for the highest degree of burn takes sequencing priority among those site-specific codes.<\/li>\n\n\n\n<li><strong>T31 as an additional code<\/strong>: T31 category codes, including T31.85, report burn extent and are sequenced as an additional code alongside the site-specific T20-T25 burn code, which usually carries the principal diagnosis. T31 is used as the principal\/first-listed code only when the burn site itself is unspecified.<\/li>\n\n\n\n<li><strong>T31 is not exclusive to inpatient<\/strong>: T31.85 can appear on outpatient claims where the level of service reflects the burn assessment, though extensive burns typically result in inpatient admission.<\/li>\n\n\n\n<li><strong>T31 vs. T32 rule<\/strong>: use T32 codes (corrosions by extent) only when the burn agent is chemical. Flame, steam, hot liquids, and contact burns code to T31.<\/li>\n\n\n\n<li><strong>Additional codes<\/strong>: code any associated smoke inhalation (J70.5), respiratory complications, or fluid resuscitation complications separately per official guidelines.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Coders working across multiple ICD-10 article types can also review ICD-10 Code R64 for another example of documentation-dependent sequencing. Official FY2026 guidelines are published by the <a href=\"https:\/\/www.icd10data.com\/\" target=\"_blank\" rel=\"nofollow noopener\">ICD-10 Data reference<\/a>, which mirrors CMS and NCHS release data.<\/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                    Streamline your clinical documentation and billing workflows                <\/h3>\n\n                <p class=\"description\">\n                    Pabau helps burn units and complex-care facilities maintain accurate, structured documentation that supports correct ICD-10 Code T31.85 coding at every admission. Build compliant burn assessment templates, automate coding checklists, and reduce claim denials.                <\/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\"\n                    loading=\"lazy\"\n                \/>\n            <\/div>\n        <\/div>\n        \n\n\n<h2 id=\"h-ms-drg-mapping-and-reimbursement-impact-of-t31-85\" class=\"wp-block-heading\">MS-DRG mapping and reimbursement impact of T31.85<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Accurate use of ICD-10 Code T31.85 directly influences the MS-DRG assigned to the inpatient stay, which determines the base payment rate under Medicare&#8217;s Inpatient Prospective Payment System. Extensive burns map to high-weight DRGs because of the resource intensity involved.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">T31.85 maps to one of several MS-DRGs depending on mechanical ventilation, skin grafting, and inhalation injury. DRG 927 (Extensive Burns or Full Thickness Burns with Mechanical Ventilation 96+ Hours with Skin Graft) applies when both prolonged ventilation and a skin graft are documented. DRG 933 covers the same ventilation threshold without a graft.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">DRG 928 and DRG 929 (Full Thickness Burn with Skin Graft or Inhalation Injury, with and without CC\/MCC respectively) apply when a graft or inhalation injury is present but the case doesn&#8217;t meet the DRG 927\/933 ventilation threshold.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Without a skin graft, mechanical ventilation, or inhalation injury, a T31.85 case falls to DRG 934 (Full Thickness Burn without Skin Graft or Inhalation Injury) or DRG 935 (Non-Extensive Burns), depending on overall severity.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Three factors shift the DRG assignment for T31.85 cases:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>MCC (major complication or comorbidity)<\/strong>: inhalation injury, sepsis, acute renal failure, or mechanical ventilation for 96+ hours elevate the DRG<\/li>\n\n\n\n<li><strong>CC (complication or comorbidity)<\/strong>: secondary infection, nutritional complications, or fluid imbalances present mid-admission<\/li>\n\n\n\n<li><strong>Skin grafting procedure<\/strong>: any autograft or allograft procedure code shifts assignment toward the grafting DRGs<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">DRG weights change annually. Coders and revenue cycle teams should confirm the FY2026 relative weights through the CMS IPPS grouper tables. Facilities using HIPAA-compliant practice software with integrated revenue cycle reporting can track DRG assignment trends across burn admissions to identify documentation shortfalls before year-end audits.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Plastic surgery and dermatology practices managing burn reconstruction and skin grafts can also explore plastic surgery EMR and dermatology EMR software built for high-acuity procedure documentation.<\/p>\n\n\n\n<h2 id=\"h-common-coding-errors-for-t31-85-and-how-to-avoid-them\" class=\"wp-block-heading\">Common coding errors for T31.85 and how to avoid them<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The T31.8X subcategory has a low per-claim volume but a high denial rate when errors occur. Most mistakes fall into four patterns:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Wrong second-axis digit<\/strong>: coding T31.84 (40-49% third-degree) when documentation supports 52% full thickness. The physician note says &#8220;majority third degree&#8221; without a percentage, and the coder defaults to the lower adjacent code. Query for specificity.<\/li>\n\n\n\n<li><strong>Confusing TBSA with third-degree percentage<\/strong>: treating &#8220;85% third degree&#8221; in the note as meaning 85% TBSA is third degree, rather than 85% of the burned area. Read the note carefully for how the percentage is expressed.<\/li>\n\n\n\n<li><strong>Using T32 for thermal burns<\/strong>: chemical agent is absent, but the coder applies a T32 code because the wound is severe. T31 applies to all thermal burns regardless of severity.<\/li>\n\n\n\n<li><strong>Missing the T31 code when site-specific codes are present<\/strong>: guidelines permit additional T31 codes for extent reporting even when T20-T25 site codes are used. Omitting T31.85 loses extent data and may affect DRG assignment.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Coders managing complex burn cases can apply the same documentation discipline used in other high-denial-risk categories.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Clinical note templates that prompt for TBSA percentage, third-degree percentage, and burn cause reduce all four error types at the point of documentation. Facilities can implement these through AI-assisted clinical documentation tools that structure notes around required coding fields.<\/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 audit on T31.8X claims: pull all cases coded T31.80 or T31.81 (0% or 10-19% third-degree) and review whether burn depth documentation actually supports that low a third-degree proportion. Under-coding the depth axis on high-TBSA cases is a common pattern that depresses DRG weight and reimbursement.<\/p>\n            <\/div>\n        <\/div>\n    \n\n\n<h2 class=\"wp-block-heading\">Related ICD-10 codes<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-t84119d\/\">ICD-10 code T84.119D \u2014 Broken internal fixation device<\/a><\/li>\n\n\n<li><a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-t3191\/\">ICD-10 Code T31.91 \u2014 90%+ TBSA, 10-19% third-degree burns<\/a><\/li>\n\n\n<li><a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-t3194\/\">ICD-10 Code T31.94 \u2014 Burns involving 90% or more of body<\/a><\/li>\n\n\n<li><a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-t3284\/\">ICD-10 Code T32.84 \u2014 Corrosions 80-89% TBSA<\/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\">Burns covering 80-89% of total body surface area with 50-59% third-degree involvement demand precise, two-axis documentation before ICD-10 Code T31.85 can be coded accurately. The difference between T31.84 and T31.86 is ten percentage points of full-thickness depth, and that distinction shifts reimbursement through the MS-DRG grouper.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Practice management software like Pabau supports burn unit teams with structured clinical documentation templates and coding workflow checklists that capture TBSA percentage, depth by region, and burn cause at the point of care, reducing both query volume and denial rates. To see how Pabau supports complex inpatient documentation, <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>Need another example of high-specificity ICD-10 coding?<\/strong> <a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-h908\/\" target=\"_blank\" rel=\"noopener\">ICD-10 Code H90.8<\/a> covers billable status and documentation requirements for a commonly miscoded hearing loss diagnosis.<\/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>Want to see how nerve-related codes handle sequencing?<\/strong> <a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-g55\/\" target=\"_blank\" rel=\"noopener\">ICD-10 Code G55<\/a> walks through coding for nerve root and plexus compression diagnoses.<\/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 anesthesia claims too?<\/strong> <a href=\"https:\/\/pabau.com\/procedure-codes\/cpt-code-01742\/\" target=\"_blank\" rel=\"noopener\">CPT Code 01742<\/a> covers billing guidance for anesthesia during elbow osteotomy procedures.<\/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-1784274804623\"><h3 class=\"schema-faq-question\">What does ICD-10 Code T31.85 mean?<\/h3> <p class=\"schema-faq-answer\">ICD-10 Code T31.85 is a billable diagnosis code describing burns involving 80-89% of total body surface area where 50-59% of the burned area is third-degree (full thickness) burns. It falls under the T31 category, which classifies burns by the extent of body surface involved using the Rule of Nines or Lund-Browder chart.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1784274804624\"><h3 class=\"schema-faq-question\">Is T31.85 a billable ICD-10-CM code?<\/h3> <p class=\"schema-faq-answer\">Yes, T31.85 is a billable\/specific ICD-10-CM code valid for FY2026 (effective October 1, 2025). It can be submitted on both CMS-1500 and UB-04 claim forms for HIPAA-covered transactions.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1784274804625\"><h3 class=\"schema-faq-question\">What is the difference between T31 and T32 burn codes?<\/h3> <p class=\"schema-faq-answer\">T31 codes classify burns caused by heat or flame (thermal burns), organized by total body surface area affected. T32 codes cover corrosions caused by chemical agents, using the same TBSA percentage structure. If the burn agent is chemical, use T32; for all thermal sources (flame, steam, contact, hot liquids), use T31.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1784274804626\"><h3 class=\"schema-faq-question\">How do you calculate the third-degree percentage for T31.85 coding?<\/h3> <p class=\"schema-faq-answer\">Divide the documented area of third-degree (full thickness) burns by the total TBSA burned, then multiply by 100. For example, if 85% TBSA is burned and 45% of body surface is full thickness, the calculation is 45\/85 = 52.9%, which falls in the 50-59% range confirming T31.85. Partial thickness areas are excluded from the numerator.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1784274804627\"><h3 class=\"schema-faq-question\">What documentation is required to code T31.85?<\/h3> <p class=\"schema-faq-answer\">Required documentation includes: physician-documented TBSA percentage (80-89%) using the Rule of Nines, burn depth specified by body region, explicit statement or calculable evidence that 50-59% of the burned area is third-degree, confirmation that the burn is thermal (not chemical), and the date of injury. Missing any element creates grounds for a coding query or claim denial.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1784274804628\"><h3 class=\"schema-faq-question\">When did T31.85 become effective in ICD-10-CM?<\/h3> <p class=\"schema-faq-answer\">T31.85 is valid for claims with a date of service on or after October 1, 2025 under the FY2026 ICD-10-CM code set. Confirm the active status against the current FY release files published by CDC\/NCHS before submitting claims dated before that effective date.<\/p> <\/div> <\/div>\n","protected":false},"excerpt":{"rendered":"<p>ICD-10 Code T31.85 describes burns involving 80-89% of total body surface area (TBSA) where 50-59% of the burned area is third-degree (full thickness). It&#8217;s a billable ICD-10-CM code, effective for FY2026, used when both the total burn extent and the depth of tissue damage need separate documentation for accurate MS-DRG assignment. This reference covers the [&hellip;]<\/p>\n","protected":false},"author":77,"featured_media":158254,"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":[1549,1550],"tags":[],"class_list":["post-157985","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-diagnostic-codes","category-icd-10-cm"],"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 T31.85: Burns involving 80-89% body surface area<\/title>\n<meta name=\"description\" content=\"ICD-10 Code T31.85 covers burns affecting 80-89% of body surface area with 50-59% 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is an all-in-one healthcare practice management software platform designed for clinics, medspas, therapists, and medical professionals. 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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\\\/nl\\\/blog\\\/author\\\/katy-piper\\\/\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-t3185\\\/#faq-question-1784274804623\",\"position\":1,\"url\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-t3185\\\/#faq-question-1784274804623\",\"name\":\"What does ICD-10 Code T31.85 mean?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"ICD-10 Code T31.85 is a billable diagnosis code describing burns involving 80-89% of total body surface area where 50-59% of the burned area is third-degree (full thickness) burns. 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