{"id":170773,"date":"2026-07-31T13:51:47","date_gmt":"2026-07-31T13:51:47","guid":{"rendered":"https:\/\/pabau.com\/?p=170773"},"modified":"2026-08-17T12:26:36","modified_gmt":"2026-08-17T12:26:36","slug":"icd-10-code-m318","status":"publish","type":"post","link":"https:\/\/pabau.com\/es\/diagnostic-codes\/icd-10-code-m318\/","title":{"rendered":"ICD-10 Code M31.8: Other specified necrotizing vasculopathies"},"content":{"rendered":"\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"MedicalWebPage\",\"headline\":\"ICD-10 Code M31.8: Other specified necrotizing vasculopathies\",\"description\":\"ICD-10 Code M31.8 (Other specified necrotizing vasculopathies) is a billable 2026 ICD-10-CM diagnosis code. Get code details, synonyms, related codes, and documentation guidance.\",\"url\":\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-m318\/\",\"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\":\"2026-07-30\",\"dateModified\":\"2026-08-03\"}<\/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 M31.8 describes other specified necrotizing vasculopathies, a billable ICD-10-CM diagnosis code valid for FY2026 submissions.<\/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>Use M31.8 when documentation identifies a specific necrotizing vasculopathy that does not fit any named subcategory in the M31 block.<\/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>M31.9 applies only when the vasculopathy cannot be specified further. M31.8 requires the clinician to name the condition.<\/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 tracks code submissions and flags unspecified code patterns before claims leave the practice.<\/p>\n                        <\/div>\n                                                <\/div>\n        <\/div>\n    \n\n\n<h2 class=\"wp-block-heading\">ICD-10 Code M31.8: definition and billable status<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>ICD-10 Code M31.8<\/strong> is a billable ICD-10-CM diagnosis code used to document <em>other specified necrotizing vasculopathies<\/em>. It falls under category M31 (Other necrotizing vasculopathies), within chapter M00-M99 for diseases of the musculoskeletal system and connective tissue. According to the <a href=\"https:\/\/www.cms.gov\/medicare\/coding-billing\/icd-10-codes\" target=\"_blank\" rel=\"nofollow noopener\">CMS ICD-10 codes page<\/a>, M31.8 is valid and billable for fiscal year 2026.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Coders reach for M31.8 when clinical documentation identifies a specific necrotizing vasculopathy that does not match any named condition within M31.0 through M31.7. The \u00abother specified\u00bb designation means the condition is documented, but does not map to a more granular ICD-10-CM code in the same block.<\/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\">\n<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>\n<\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Code details at a glance<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The table below summarizes the key administrative facts for ICD-10 Code M31.8, as published in the FY2026 ICD-10-CM tabular list.<\/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\">Detail<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Code<\/td>\n<td style=\"padding:12px 16px;color:#374151\">M31.8<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Description<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Other specified necrotizing vasculopathies<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Billable \/ Valid<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Yes &#8211; valid for claim submission<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">FY Effective<\/td>\n<td style=\"padding:12px 16px;color:#374151\">FY2026 (October 1, 2025 &#8211; September 30, 2026)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Chapter<\/td>\n<td style=\"padding:12px 16px;color:#374151\">M00-M99: Diseases of the musculoskeletal system and connective tissue<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Block \/ Category<\/td>\n<td style=\"padding:12px 16px;color:#374151\">M30-M36 \/ M31 Other necrotizing vasculopathies<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Code Type<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Diagnosis (ICD-10-CM)<\/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 Set<\/td>\n<td style=\"padding:12px 16px;color:#374151\">ICD-10-CM (US clinical modification)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">As the <a href=\"https:\/\/icd.who.int\/browse10\/2019\/en\" target=\"_blank\" rel=\"nofollow noopener\">WHO ICD-10 browser<\/a> confirms, the M31 category sits within the systemic connective tissue disorders block, M30-M36. ICD-10-CM keeps the same hierarchical position and adds US-specific clinical modifications from the CDC NCHS. Those modifications are mandated under HIPAA for all covered entities.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What does M31.8 mean clinically?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Necrotizing vasculopathies are a group of disorders marked by inflammation and destruction of blood vessel walls, which leads to tissue ischemia and necrosis. M31.8 captures cases where the treating clinician documents the pathology. The findings do not meet the criteria for any specifically named condition within the M31 block.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Rheumatologists, internists. M31.8 is the right code for those cases, as long as the documentation specifies the condition rather than leaving it open-ended. Complete patient records are what support that specificity when a payer asks.<\/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-m318\/comprehensive-patient-records.webp\" alt=\"Comprehensive patient records\"\/><figcaption class=\"wp-element-caption\"><em>Pabau keeps biopsy findings, referral letters, and the physician&#8217;s exact wording on one patient record, which is what an M31.8 claim rests on.<\/em><\/figcaption><\/figure>\n\n\n\n<div style=\"height:35px;width:800px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Conditions that may map to M31.8 include, but are not limited to:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Necrotizing vasculitis of small or medium vessels, documented specifically but not matching a named M31 subcategory<\/li><li>Autoimmune vasculopathy with necrosis, confirmed on biopsy, without further classification<\/li><li>Hypocomplementemic urticarial vasculitis with documented necrotizing features<\/li><li>Drug-induced necrotizing vasculitis, with the causative agent named in the record<\/li><li>Isolated cutaneous necrotizing vasculitis with systemic features that fall short of the systemic vasculitis codes<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The key documentation requirement is that the treating physician has named or described a specific vasculopathy. Without that specificity, coders must default to M31.9. Accurate medical forms at the point of care prevent downstream coding ambiguity.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">An <a href=\"https:\/\/pabau.com\/industry\/physical-therapy-emr\/\">EMR built for physical therapy<\/a> ties these codes to exercise programs and measurable progress.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Synonyms and alternate names for M31.8<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The ICD-10-CM alphabetic index includes several entry paths that lead coders to M31.8. Knowing these synonyms helps when documentation uses terminology different from the official code description.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Other specified necrotizing vasculopathy<\/li><li>Necrotizing vasculopathy NOS (specified type)<\/li><li>Specified necrotizing angiitis<\/li><li>Necrotizing vasculitis, specified NEC<\/li><li>Autoimmune necrotizing vasculopathy, specified type<\/li><li>Ischemic vasculopathy with necrosis, specified<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">When a pathology report or rheumatology note uses any of these terms with a named descriptor, M31.8 beats the unspecified alternative. The <a href=\"https:\/\/www.aapc.com\/codes\/icd-10-codes-range\/\" target=\"_blank\" rel=\"nofollow noopener\">AAPC Codify ICD-10-CM lookup<\/a> catalogs these synonyms against M31.8.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where M31.8 sits in the M31 hierarchy<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Understanding where M31.8 sits within the M31 block helps coders identify whether a more specific code applies. The full category covers other necrotizing vasculopathies, and each subcategory describes a distinct named condition. M31.8 is the residual \u00abother specified\u00bb slot before the catch-all M31.9.<\/p>\n\n\n\n<table style=\"width:100%;border-collapse:separate;border-spacing:0;border-radius:12px;overflow:hidden;font-size:15px;line-height:1.5;margin:1.5em 0 2em;box-shadow:0 2px 12px rgba(0,0,0,0.08)\">\n<thead>\n<tr>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Code<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Description<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">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\">M31.0<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Hypersensitivity angiitis (Goodpasture&#8217;s syndrome)<\/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\">M31.1<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Thrombotic microangiopathy<\/td>\n<td style=\"padding:12px 16px;color:#374151\">No \u2013 use child code M31.10, M31.11, or M31.19<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">M31.2<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Lethal midline granuloma<\/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\">M31.3x<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Wegener&#8217;s granulomatosis (with\/without renal involvement)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Yes (subcodes)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">M31.4<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Aortic arch syndrome (Takayasu&#8217;s disease)<\/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\">M31.5<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Giant cell arteritis with polymyalgia rheumatica<\/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\">M31.6<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Other giant cell arteritis<\/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\">M31.7<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Microscopic polyangiitis<\/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\">M31.8<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Other specified necrotizing vasculopathies<\/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\"><a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-m319\/\">M31.9<\/a><\/td>\n<td style=\"padding:12px 16px;color:#374151\">Necrotizing vasculopathy, unspecified<\/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\">Coders should work through M31.0 to M31.7 before reaching M31.8. Where the documented condition matches a named subcategory, that more specific code takes priority. M31.8 applies only when the condition is named or described, but falls outside the existing entries.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Two traps sit inside this table. M31.1 is a parent code rather than a billable one, so a claim needs M31.10, M31.11, or M31.19 instead. And several vasculitides sit outside M31 altogether. The <a href=\"https:\/\/icd10cmtool.cdc.gov\/\" target=\"_blank\" rel=\"nofollow noopener\">CDC\/NCHS ICD-10-CM web tool<\/a> carries the official tabular list for any fiscal year.<\/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>Before coding M31.8, run through the full M31 code range in order. Document in the coding rationale why each named subcategory does not apply. That note protects the claim during an audit and shows why you chose this level of specificity.<\/p>\n            <\/div>\n        <\/div>\n    \n\n\n<h2 class=\"wp-block-heading\">M31.8 vs M31.9: choosing the right necrotizing vasculopathy code<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The split between M31.8 and M31.9 comes down to how specific the documentation is. Severity plays no part in it, which is where a lot of denials start.<\/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\">Factor<\/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\">M31.8 (Other specified)<\/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\">M31.9 (Unspecified)<\/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\">Documentation<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Clinician names or describes the specific vasculopathy<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Documentation does not specify the type<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Specificity<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Condition identified, but no named M31 subcategory exists for it<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Type cannot be determined from the available information<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Payer preference<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Preferred, because it demonstrates clinical specificity<\/td>\n<td style=\"padding:12px 16px;color:#374151\">May trigger medical necessity queries from payers<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Coder action<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Use when documentation names a condition outside M31.0-M31.7<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Use as a last resort, when querying the physician is impractical<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Query guidance<\/td>\n<td style=\"padding:12px 16px;color:#374151\">No query needed if the condition is named in the note<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Consider querying the physician to add specificity<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">Here is the practical decision rule. If the note says \u00abnecrotizing vasculitis consistent with hypocomplementemic urticarial vasculitis,\u00bb use M31.8, because the condition has a name and no code of its own. If it says \u00abnecrotizing vasculopathy, type unclear, further workup pending,\u00bb use M31.9 and consider a physician query before you finalize the claim.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Coding guidelines and documentation requirements<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The ICD-10-CM Official Guidelines for Coding and Reporting, maintained by the CDC NCHS and CMS, govern how coders apply M31.8. Several rules bear directly on this code.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Use of \u00abother specified\u00bb codes<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">ICD-10-CM guidelines require coders to assign the highest level of specificity the medical record supports. Codes like M31.8 fit when the documentation identifies a specific condition that the classification has no unique code for. Coders should never assign M31.8 based on their own clinical judgment about what the condition might be.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Under HIPAA compliance requirements, covered entities must use codes that accurately reflect the documented diagnosis. Choosing M31.9 when M31.8 is supportable can expose the claim to denial for insufficient specificity. <\/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-m318\/hipaa-compliance-in-pabau.webp\" alt=\"HIPAA compliance in Pabau\"\/><figcaption class=\"wp-element-caption\"><em>Pabau&#8217;s compliance tools log who opened and changed each record, so the documentation behind an M31.8 claim holds up in an audit.<\/em><\/figcaption><\/figure>\n\n\n\n<div style=\"height:35px;width:800px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Additional code requirements<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">No mandatory additional codes are required with M31.8. However, coders should consider:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>An external cause code if the vasculopathy is drug-induced, such as a T-code from the adverse effects table<\/li><li>Organ-specific manifestation codes where appropriate, such as an N00-N29 code for renal involvement<\/li><li>Codes for associated conditions, including ANCA-associated markers or autoimmune serology findings, where a specific code exists<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Excludes and includes notes<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The M31 category includes conditions previously classified with polyarteritis nodosa and related conditions in ICD-9. Coders should check for Excludes1 or Excludes2 notes at the M31 category level that apply to the condition being coded. <\/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-m318\/digital-forms.webp\" alt=\"Digital forms\"\/><figcaption class=\"wp-element-caption\"><em>Pabau&#8217;s digital forms capture the physician&#8217;s own wording at the point of care, which is the wording an M31.8 claim needs.<\/em><\/figcaption><\/figure>\n\n\n\n<div style=\"height:35px;width:800px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Index entries that lead to M31.8<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The alphabetic index provides multiple entry paths to reach M31.8. Coders who know the condition name but not the code can use these routes to verify their selection.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Vasculopathy, necrotizing<\/strong> \u2192 see Vasculopathy, necrotizing (M31.-) \u2192 other specified \u2192 M31.8<\/li><li><strong>Vasculitis, necrotizing<\/strong> \u2192 NEC \u2192 M31.8<\/li><li><strong>Angiitis<\/strong> \u2192 necrotizing \u2192 specified type NEC \u2192 M31.8<\/li><li><strong>Vasculopathy<\/strong> \u2192 autoimmune, specified NEC \u2192 M31.8<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Index routes can vary slightly by ICD-10-CM edition year. Always verify against the current year&#8217;s official index before you finalize a code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Code history and FY2026 validity<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ICD-10 Code M31.8 has been a stable entry in the tabular list since the US adopted ICD-10-CM. The code has not been revised in recent fiscal years and is confirmed valid for FY2026, effective October 1, 2025. No new additions within the M31 block affect its scope this year.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Check the CMS annual ICD-10-CM update files each October. A new named vasculopathy code in M31.x would narrow the scope of M31.8. Conditions that map here today may get their own code later. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Rare conditions also carry a privacy consideration. Small patient populations make re-identification easier. Review your data governance policies on the same October schedule.<\/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>Set a recurring reminder for October 1 each year to check the CMS ICD-10-CM addenda for new M31.x codes. If a new named vasculopathy code appears, claims for that condition need the more specific code. That switch applies from the start of the new fiscal year.<\/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-m5126\/\">ICD-10 code M51.26 \u2014 Lumbar Disc Displacement<\/a><\/li>\n\n\n<li><a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-m328\/\">ICD-10 Code M32.8 \u2014 Other forms of systemic lupus erythematosus<\/a><\/li>\n\n\n<li><a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-m329\/\">ICD-10 Code M32.9 \u2014 Systemic lupus erythematosus, unspecified<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How Pabau keeps M31.8 documentation audit-ready<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In a lot of practices the denial letter arrives before anyone notices the coding problem. The clinician&#8217;s note sits in one system and the claim leaves from another, so nothing compares the two until a payer asks a question.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Practice management software like Pabau keeps both on the same record. Charting, intake forms, biopsy results, and the diagnosis attached to the claim all sit on one patient timeline. When a coder opens an M31.8 claim, the note that names the vasculopathy is one click away. Nobody has to chase the physician a month later.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pabau then tracks what you actually submit. You can see how often unspecified codes leave the practice and which encounters they came from. For small specialty practices without a dedicated coding team, that pattern is usually the quickest denial source to fix.<\/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                    Reduce diagnostic coding errors with Pabau                <\/h3>\n\n                <p class=\"description\">\n                    Pabau&#8217;s claims and compliance tools help specialty practices track ICD-10 submissions and spot unspecified code patterns early. You get documentation workflows that keep every claim audit-ready.                <\/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 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Coding errors on M31.8 come from two directions. Coders default to M31.9 when the physician has already named the condition. Others reach for M31.8 when a named code such as M31.7 fits better. Both are documentation problems before they are coding problems.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fix the note and the code follows. Ask the clinician to name the vasculopathy in the record and keep the biopsy wording intact. The choice between M31.8 and M31.9 then stops being a judgment call at claim time. <a href=\"https:\/\/pabau.com\/book-demo\/\">Book a demo<\/a> to see how Pabau handles diagnostic documentation and claims tracking for specialty practices.<\/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>Coding giant cell arteritis alongside polymyalgia rheumatica?<\/strong> <a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-m315\/\">M31.5<\/a> covers the combined presentation and the documentation payers expect to see.<\/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>Ruling out polyarteritis nodosa before you settle on M31.8?<\/strong> <a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-m300\/\">M30.0<\/a> sets out the named criteria and how the M30 block differs from M31.<\/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>Documenting a condition related to polyarteritis nodosa?<\/strong> <a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-m308\/\">M30.8<\/a> explains when the related-condition code applies instead of a code from M31.<\/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>Need intake forms that capture systemic findings?<\/strong> The <a href=\"https:\/\/pabau.com\/templates\/endocrine-review-of-systems\/\">review of systems template<\/a> gives you a structured way to record multi-system symptoms at the first visit.<\/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 biologics in a rheumatology practice?<\/strong> <a href=\"https:\/\/pabau.com\/procedure-codes\/hcpcs-code-j0717\/\">J0717<\/a> walks through units, documentation, and the denials that follow a short administration note.<\/p>\n                        <\/div>\n                                                <\/div>\n        <\/div>\n    \n\n\n<h2 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-1785497456276\"><h3 class=\"schema-faq-question\">What is ICD-10 Code M31.8?<\/h3> <p class=\"schema-faq-answer\">ICD-10 Code M31.8 is a billable ICD-10-CM diagnosis code for other specified necrotizing vasculopathies. It applies when clinical documentation identifies a specific necrotizing vasculopathy that does not fit a named subcategory within the M31 block. The code is valid for FY2026 submissions under the CMS ICD-10-CM tabular list.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1785497456277\"><h3 class=\"schema-faq-question\">Is M31.8 a billable ICD-10-CM code?<\/h3> <p class=\"schema-faq-answer\">Yes. M31.8 is a billable ICD-10-CM diagnosis code, valid for claim submission for fiscal year 2026. That year runs from October 1, 2025 through September 30, 2026. The CMS ICD-10-CM tabular list confirms its billable status.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1785497456278\"><h3 class=\"schema-faq-question\">What is the difference between M31.8 and M31.9?<\/h3> <p class=\"schema-faq-answer\">M31.8 applies when the clinician has documented a specific necrotizing vasculopathy that does not match a named subcategory. M31.9 covers unspecified necrotizing vasculopathy, and is used only when the type cannot be determined from the documentation. Payers generally prefer M31.8 where the record supports it.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1785497456279\"><h3 class=\"schema-faq-question\">What conditions are classified under M31 necrotizing vasculopathies?<\/h3> <p class=\"schema-faq-answer\">The M31 category runs from M31.0 to M31.9. It covers hypersensitivity angiitis, thrombotic microangiopathy, lethal midline granuloma, and Wegener&#8217;s granulomatosis. It also covers Takayasu&#8217;s disease, giant cell arteritis with or without polymyalgia rheumatica, and microscopic polyangiitis. M31.8 closes the block for named conditions with no code of their own, and M31.9 covers unspecified cases.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1785497456280\"><h3 class=\"schema-faq-question\">Which ICD-10 vasculitis codes are related to M31.8?<\/h3> <p class=\"schema-faq-answer\">Closely related codes include M30.0 for polyarteritis nodosa, M30.1 for polyarteritis with lung involvement, and M31.3x for Wegener&#8217;s granulomatosis. M31.7 covers microscopic polyangiitis, and M31.9 is the direct sibling for unspecified cases. Review the full M30-M36 block when necrotizing vascular pathology involves systemic connective tissue conditions.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1785497456281\"><h3 class=\"schema-faq-question\">Is ICD-10 Code M31.8 valid for 2026 submissions?<\/h3> <p class=\"schema-faq-answer\">Yes. ICD-10 Code M31.8 is valid for FY2026 submissions, effective October 1, 2025. The code was not revised or deleted in the FY2026 ICD-10-CM update cycle. Check the annual CMS addenda each October to confirm it stays valid in future fiscal years.<\/p> <\/div> <\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>M31.8 is billable for FY2026. Use it when the note names a necrotizing vasculopathy that has no code of its own.<\/p>\n","protected":false},"author":81,"featured_media":170772,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_linkdex":"","_yoast_wpseo_content_score":"90","_yoast_wpseo_is_cornerstone":"","_yoast_wpseo_keywordsynonyms":"[\"\",\"\",\"\",\"\"]","_yoast_wpseo_focuskw_text_input":"","_seo_original_html":"","footnotes":""},"categories":[1549,1550],"tags":[2387,1543,2394,2635,3132],"class_list":["post-170773","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-diagnostic-codes","category-icd-10-cm","tag-claim-denials","tag-clinical-documentation","tag-coding-compliance","tag-rheumatology-coding","tag-vasculitis"],"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 M31.8: Billable status and FY2026 coding rules<\/title>\n<meta name=\"description\" content=\"M31.8 is billable for FY2026. Use it when the note names a necrotizing vasculopathy that has no code of its own.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/pabau.com\/es\/diagnostic-codes\/icd-10-code-m318\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ICD-10 Code M31.8: Billable status and FY2026 coding rules\" \/>\n<meta property=\"og:description\" content=\"M31.8 is billable for FY2026. Use it when the note names a necrotizing vasculopathy that has no code of its own.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/pabau.com\/es\/diagnostic-codes\/icd-10-code-m318\/\" \/>\n<meta property=\"og:site_name\" content=\"Pabau\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Pabau\/\" \/>\n<meta property=\"article:published_time\" content=\"2026-07-31T13:51:47+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-08-17T12:26:36+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/pabau.com\/wp-content\/uploads\/2026\/07\/icd-10-code-m318.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"630\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"Aleksandar Kochovski\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@pabaucrm\" \/>\n<meta name=\"twitter:site\" content=\"@pabaucrm\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Aleksandar Kochovski\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tiempo de lectura\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minuto\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m318\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m318\\\/\"},\"author\":{\"name\":\"Aleksandar Kochovski\",\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/#\\\/schema\\\/person\\\/73b672a49e20bfba8161e3c17ee3dda2\"},\"headline\":\"ICD-10 Code M31.8: Other specified necrotizing vasculopathies\",\"datePublished\":\"2026-07-31T13:51:47+00:00\",\"dateModified\":\"2026-08-17T12:26:36+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m318\\\/\"},\"wordCount\":2007,\"publisher\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m318\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/pabau.com\\\/wp-content\\\/uploads\\\/2026\\\/07\\\/icd-10-code-m318.webp\",\"keywords\":[\"Claim denials\",\"Clinical Documentation\",\"Coding Compliance\",\"Rheumatology coding\",\"Vasculitis\"],\"articleSection\":[\"Diagnostic Codes\",\"ICD-10-CM\"],\"inLanguage\":\"es\"},{\"@type\":[\"WebPage\",\"FAQPage\"],\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m318\\\/\",\"url\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m318\\\/\",\"name\":\"ICD-10 Code M31.8: Billable status and FY2026 coding rules\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m318\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m318\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/pabau.com\\\/wp-content\\\/uploads\\\/2026\\\/07\\\/icd-10-code-m318.webp\",\"datePublished\":\"2026-07-31T13:51:47+00:00\",\"dateModified\":\"2026-08-17T12:26:36+00:00\",\"description\":\"M31.8 is billable for FY2026. 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He specializes in topics around compliance in software solutions. When he's not writing at Pabau, you can find him tending to his bonsai collection or hitting the gym.\",\"url\":\"https:\\\/\\\/pabau.com\\\/es\\\/blog\\\/author\\\/aleksandar-kochovski\\\/\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m318\\\/#faq-question-1785497456276\",\"position\":1,\"url\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m318\\\/#faq-question-1785497456276\",\"name\":\"What is ICD-10 Code M31.8?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"ICD-10 Code M31.8 is a billable ICD-10-CM diagnosis code for other specified necrotizing vasculopathies. It applies when clinical documentation identifies a specific necrotizing vasculopathy that does not fit a named subcategory within the M31 block. The code is valid for FY2026 submissions under the CMS ICD-10-CM tabular list.\",\"inLanguage\":\"es\"},\"inLanguage\":\"es\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m318\\\/#faq-question-1785497456277\",\"position\":2,\"url\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m318\\\/#faq-question-1785497456277\",\"name\":\"Is M31.8 a billable ICD-10-CM code?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes. M31.8 is a billable ICD-10-CM diagnosis code, valid for claim submission for fiscal year 2026. That year runs from October 1, 2025 through September 30, 2026. The CMS ICD-10-CM tabular list confirms its billable status.\",\"inLanguage\":\"es\"},\"inLanguage\":\"es\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m318\\\/#faq-question-1785497456278\",\"position\":3,\"url\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m318\\\/#faq-question-1785497456278\",\"name\":\"What is the difference between M31.8 and M31.9?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"M31.8 applies when the clinician has documented a specific necrotizing vasculopathy that does not match a named subcategory. M31.9 covers unspecified necrotizing vasculopathy, and is used only when the type cannot be determined from the documentation. Payers generally prefer M31.8 where the record supports it.\",\"inLanguage\":\"es\"},\"inLanguage\":\"es\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m318\\\/#faq-question-1785497456279\",\"position\":4,\"url\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m318\\\/#faq-question-1785497456279\",\"name\":\"What conditions are classified under M31 necrotizing vasculopathies?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The M31 category runs from M31.0 to M31.9. It covers hypersensitivity angiitis, thrombotic microangiopathy, lethal midline granuloma, and Wegener's granulomatosis. It also covers Takayasu's disease, giant cell arteritis with or without polymyalgia rheumatica, and microscopic polyangiitis. 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He specializes in topics around compliance in software solutions. When he's not writing at Pabau, you can find him tending to his bonsai collection or hitting the gym.","url":"https:\/\/pabau.com\/es\/blog\/author\/aleksandar-kochovski\/"},{"@type":"Question","@id":"https:\/\/pabau.com\/es\/diagnostic-codes\/icd-10-code-m318\/#faq-question-1785497456276","position":1,"url":"https:\/\/pabau.com\/es\/diagnostic-codes\/icd-10-code-m318\/#faq-question-1785497456276","name":"What is ICD-10 Code M31.8?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"ICD-10 Code M31.8 is a billable ICD-10-CM diagnosis code for other specified necrotizing vasculopathies. It applies when clinical documentation identifies a specific necrotizing vasculopathy that does not fit a named subcategory within the M31 block. The code is valid for FY2026 submissions under the CMS ICD-10-CM tabular list.","inLanguage":"es"},"inLanguage":"es"},{"@type":"Question","@id":"https:\/\/pabau.com\/es\/diagnostic-codes\/icd-10-code-m318\/#faq-question-1785497456277","position":2,"url":"https:\/\/pabau.com\/es\/diagnostic-codes\/icd-10-code-m318\/#faq-question-1785497456277","name":"Is M31.8 a billable ICD-10-CM code?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Yes. M31.8 is a billable ICD-10-CM diagnosis code, valid for claim submission for fiscal year 2026. That year runs from October 1, 2025 through September 30, 2026. The CMS ICD-10-CM tabular list confirms its billable status.","inLanguage":"es"},"inLanguage":"es"},{"@type":"Question","@id":"https:\/\/pabau.com\/es\/diagnostic-codes\/icd-10-code-m318\/#faq-question-1785497456278","position":3,"url":"https:\/\/pabau.com\/es\/diagnostic-codes\/icd-10-code-m318\/#faq-question-1785497456278","name":"What is the difference between M31.8 and M31.9?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"M31.8 applies when the clinician has documented a specific necrotizing vasculopathy that does not match a named subcategory. M31.9 covers unspecified necrotizing vasculopathy, and is used only when the type cannot be determined from the documentation. Payers generally prefer M31.8 where the record supports it.","inLanguage":"es"},"inLanguage":"es"},{"@type":"Question","@id":"https:\/\/pabau.com\/es\/diagnostic-codes\/icd-10-code-m318\/#faq-question-1785497456279","position":4,"url":"https:\/\/pabau.com\/es\/diagnostic-codes\/icd-10-code-m318\/#faq-question-1785497456279","name":"What conditions are classified under M31 necrotizing vasculopathies?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"The M31 category runs from M31.0 to M31.9. It covers hypersensitivity angiitis, thrombotic microangiopathy, lethal midline granuloma, and Wegener's granulomatosis. It also covers Takayasu's disease, giant cell arteritis with or without polymyalgia rheumatica, and microscopic polyangiitis. M31.8 closes the block for named conditions with no code of their own, and M31.9 covers unspecified cases.","inLanguage":"es"},"inLanguage":"es"},{"@type":"Question","@id":"https:\/\/pabau.com\/es\/diagnostic-codes\/icd-10-code-m318\/#faq-question-1785497456280","position":5,"url":"https:\/\/pabau.com\/es\/diagnostic-codes\/icd-10-code-m318\/#faq-question-1785497456280","name":"Which ICD-10 vasculitis codes are related to M31.8?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Closely related codes include M30.0 for polyarteritis nodosa, M30.1 for polyarteritis with lung involvement, and M31.3x for Wegener's granulomatosis. M31.7 covers microscopic polyangiitis, and M31.9 is the direct sibling for unspecified cases. Review the full M30-M36 block when necrotizing vascular pathology involves systemic connective tissue conditions.","inLanguage":"es"},"inLanguage":"es"},{"@type":"Question","@id":"https:\/\/pabau.com\/es\/diagnostic-codes\/icd-10-code-m318\/#faq-question-1785497456281","position":6,"url":"https:\/\/pabau.com\/es\/diagnostic-codes\/icd-10-code-m318\/#faq-question-1785497456281","name":"Is ICD-10 Code M31.8 valid for 2026 submissions?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Yes. ICD-10 Code M31.8 is valid for FY2026 submissions, effective October 1, 2025. The code was not revised or deleted in the FY2026 ICD-10-CM update cycle. Check the annual CMS addenda each October to confirm it stays valid in future fiscal years.","inLanguage":"es"},"inLanguage":"es"}]}},"yoast":{"focus_keyword":"ICD-10 Code M31.8","seo_title":"ICD-10 Code M31.8: Billable status and FY2026 coding rules","meta_description":"M31.8 is billable for FY2026. 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