{"id":161408,"date":"2026-07-22T12:37:00","date_gmt":"2026-07-22T12:37:00","guid":{"rendered":"https:\/\/pabau.com\/?p=161408"},"modified":"2026-08-17T12:29:53","modified_gmt":"2026-08-17T12:29:53","slug":"icd-10-code-m457","status":"publish","type":"post","link":"https:\/\/pabau.com\/es\/diagnostic-codes\/icd-10-code-m457\/","title":{"rendered":"ICD-10 Code M45.7: Ankylosing spondylitis of lumbosacral region"},"content":{"rendered":"\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"MedicalWebPage\",\"headline\":\"ICD-10 Code M45.7: Ankylosing spondylitis of lumbosacral region\",\"description\":\"ICD-10 Code M45.7 (Ankylosing Spondylitis of Lumbosacral Region) is a billable FY2026 diagnosis code. Covers synonyms, subcodes, excludes notes, and documentation requirements.\",\"url\":\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-m457\/\",\"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\":\"2026-07-22\",\"dateModified\":\"2026-07-22\"}<\/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 M45.7 describes ankylosing spondylitis of the lumbosacral region, a billable ICD-10-CM diagnosis code valid for FY2026.<\/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>M45.7 became effective October 1, 2025 and belongs to the M45 parent category covering ankylosing spondylitis by anatomical site.<\/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>Coders must specify the lumbosacral region explicitly in clinical documentation to justify M45.7 over unspecified code M45.9.<\/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 diagnostic code entry, reducing claim errors for rheumatology and musculoskeletal practices.<\/p>\n                        <\/div>\n                                                <\/div>\n        <\/div>\n    \n\n\n<p class=\"wp-block-paragraph\"><strong>ICD-10 Code M45.7<\/strong> is a billable, site-specific ICD-10-CM diagnosis code for ankylosing spondylitis of the lumbosacral region, valid for FY2026 with an effective date of October 1, 2025. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">M45.7 sits within the M45 parent category, which covers ankylosing spondylitis across all spinal regions, and within the broader M40-M54 dorsopathies block. The <a href=\"https:\/\/icd10cmtool.cdc.gov\/\" target=\"_blank\" rel=\"nofollow noopener\">CDC\/NCHS ICD-10-CM tool<\/a> confirms its validity for FY2026.<\/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-code-details-at-a-glance\" class=\"wp-block-heading\">Code details at a glance<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The table below captures the key reference data for M45.7. Coders and billing staff can use this as a quick-check before claim submission.<\/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\">M45.7<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Official description<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Ankylosing spondylitis of lumbosacral region<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Billable\/Specific<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Yes &#8211; billable for reimbursement purposes<\/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 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\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">FY2026 effective date<\/td>\n<td style=\"padding:12px 16px;color:#374151\">October 1, 2025<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Parent category<\/td>\n<td style=\"padding:12px 16px;color:#374151\">M45 (Ankylosing spondylitis)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Code block<\/td>\n<td style=\"padding:12px 16px;color:#374151\">M40-M54 Dorsopathies<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\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<\/tbody>\n<\/table>\n\n\n\n<h2 id=\"h-ankylosing-spondylitis-of-the-lumbosacral-region-clinical-overview\" class=\"wp-block-heading\">Ankylosing spondylitis of the lumbosacral region: clinical overview<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Ankylosing spondylitis (AS) is a chronic inflammatory arthritis that primarily affects the spine and sacroiliac joints, causing progressive stiffness and, over time, vertebral fusion. The lumbosacral region encompasses the junction between the lumbar spine (L1-L5) and the sacrum, including the sacroiliac joints.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is typically where AS begins clinically, making M45.7 one of the most commonly used AS subcodes in rheumatology and musculoskeletal billing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">AS is strongly associated with the HLA-B27 antigen, according to clinical guidance from the American College of Rheumatology (ACR) and the <a href=\"https:\/\/icd.who.int\/browse10\/2019\/en\" target=\"_blank\" rel=\"nofollow noopener\">WHO ICD-10 classification<\/a>. The condition typically presents in adults under 45 with insidious inflammatory back pain that improves with exercise and worsens with rest.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For coders, the critical point is that lumbosacral-region involvement must be explicitly stated in the clinical record.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Anatomical site:<\/strong> Lumbar spine (L1-L5) and sacrum, including SI joints<\/li>\n\n\n\n<li><strong>Onset pattern:<\/strong> Typically before age 45; insidious, inflammatory in character<\/li>\n\n\n\n<li><strong>HLA-B27 association:<\/strong> Present in approximately 90% of AS cases per ACR clinical information<\/li>\n\n\n\n<li><strong>Radiological findings:<\/strong> Sacroiliitis on imaging is a core diagnostic criterion<\/li>\n\n\n\n<li><strong>Why site specificity matters:<\/strong> Payers expect anatomical precision; M45.7 is not interchangeable with M45.9<\/li>\n<\/ul>\n\n\n\n<h2 id=\"h-approximate-synonyms-and-related-terms-for-ankylosing-spondylitis-icd-10-coding\" class=\"wp-block-heading\">Approximate synonyms and related terms for ankylosing spondylitis ICD-10 coding<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The following terms appear in clinical notes and documentation and map to ICD-10 Code M45.7. Coders should recognize these synonyms to ensure correct code assignment when physician language varies.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ankylosing spondylitis of lumbosacral region<\/li>\n\n\n\n<li>Lumbosacral ankylosing spondylitis<\/li>\n\n\n\n<li>Rheumatoid arthritis of the lumbosacral spine (included under M45 per WHO)<\/li>\n\n\n\n<li>Inflammatory spondylitis, lumbosacral<\/li>\n\n\n\n<li>Spondylitis ankylopoietica, lumbosacral region<\/li>\n\n\n\n<li>Bechterew disease, lumbosacral region<\/li>\n\n\n\n<li>Marie-Str\u00fcmpell disease affecting lumbosacral spine<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Note that \u00abaxial spondyloarthritis\u00bb (axSpA) is the broader clinical umbrella that includes both radiographic AS (coded as M45) and non-radiographic axSpA. When the clinical record specifically confirms radiographic AS affecting the lumbosacral region, M45.7 is the appropriate code. Good clinical documentation practices should capture these distinctions at the point of care.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Recording these codes is quicker in <a href=\"https:\/\/pabau.com\/industry\/osteopathy-practice-software\/\">osteopathy practice software<\/a> that links diagnoses to treatment plans.<\/p>\n\n\n\n<h2 id=\"h-includes-and-excludes-notes-for-the-m45-category\" class=\"wp-block-heading\">Includes and excludes notes for the M45 category<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The includes and excludes notes at the M45 parent level apply to all subcodes, including M45.7. Misreading these notes is a common source of coding errors and claim denials. The <a href=\"https:\/\/www.cms.gov\/medicare\/coding-billing\/icd-10-codes\" target=\"_blank\" rel=\"nofollow noopener\">CMS ICD-10 coding guidelines<\/a> require coders to apply parent-level notes when assigning any subcode.<\/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\">Note Type<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Code \/ Condition<\/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\">Coder Action<\/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\">Includes<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Rheumatoid arthritis of spine<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Code within M45 when documentation states rheumatoid arthritis of the spine<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Excludes<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Arthropathy in Reiter&#8217;s disease (M02.3)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Do NOT code M45.7; use M02.3 for reactive arthritis presentations<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Excludes<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Juvenile (ankylosing) spondylitis (M08.1)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Patients under 16 with juvenile AS should be coded M08.1, not M45<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Excludes<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Behcet&#8217;s disease (M35.2)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Systemic vasculitis with spinal involvement coded separately under M35.2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<h2 id=\"h-m45-7-within-the-m45-ankylosing-spondylitis-subcodes\" class=\"wp-block-heading\">M45.7 within the M45 ankylosing spondylitis subcodes<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">M45 is not itself a billable code. Payers require the site-specific subcode. The table below maps the complete M45 subcode set so coders can confirm the correct anatomical region before submission. Practices using claims management software can validate subcode specificity during the coding workflow rather than at the denial stage.<\/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-m457\/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<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:center;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\">M45.0<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Ankylosing spondylitis of multiple sites in spine<\/td>\n<td style=\"padding:12px 16px;text-align:center;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\">M45.1<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Ankylosing spondylitis of occipito-atlanto-axial region<\/td>\n<td style=\"padding:12px 16px;text-align:center;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\">M45.2<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Ankylosing spondylitis of cervical region<\/td>\n<td style=\"padding:12px 16px;text-align:center;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\">M45.3<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Ankylosing spondylitis of cervicothoracic region<\/td>\n<td style=\"padding:12px 16px;text-align:center;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\">M45.4<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Ankylosing spondylitis of thoracic region<\/td>\n<td style=\"padding:12px 16px;text-align:center;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\">M45.5<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Ankylosing spondylitis of thoracolumbar region<\/td>\n<td style=\"padding:12px 16px;text-align:center;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\">M45.6<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Ankylosing spondylitis of lumbar region<\/td>\n<td style=\"padding:12px 16px;text-align:center;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>M45.7<\/strong><\/td>\n<td style=\"padding:12px 16px;color:#374151\"><strong>Ankylosing spondylitis of lumbosacral region<\/strong><\/td>\n<td style=\"padding:12px 16px;text-align:center;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\">M45.8<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Ankylosing spondylitis sacral and sacrococcygeal region<\/td>\n<td style=\"padding:12px 16px;text-align:center;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\">M45.9<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Ankylosing spondylitis of unspecified sites in spine<\/td>\n<td style=\"padding:12px 16px;text-align:center;color:#374151\">Yes<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\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 a patient presents with AS involving both the lumbar region (M45.6) and lumbosacral region (M45.7), the lumbosacral code captures the more inclusive anatomical zone. Review the physician&#8217;s note for explicit regional language before selecting between adjacent subcodes.<\/p>\n            <\/div>\n        <\/div>\n    \n\n\n<h2 id=\"h-documentation-requirements-for-ankylosing-spondylitis-diagnosis-code-m45-7\" class=\"wp-block-heading\">Documentation requirements for ankylosing spondylitis diagnosis code M45.7<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Auditors reviewing AS claims look for three things: a confirmed diagnosis, a specified anatomical site, and supporting clinical evidence. Missing any one of these gives payers grounds to deny or downcode the claim.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Rheumatology practices apply this same specificity standard to other rheumatic diagnoses. Specificity at the point of care is always easier than querying physicians after the visit.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The checklist below reflects what must appear in the clinical record to support M45.7 during an audit or payer review.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Confirmed AS diagnosis:<\/strong> Physician documentation explicitly states ankylosing spondylitis, not \u00abpossible AS\u00bb or \u00abrule out AS\u00bb<\/li>\n\n\n\n<li><strong>Anatomical site:<\/strong> Lumbosacral region specifically identified (not just \u00ablower back\u00bb or \u00abspine\u00bb)<\/li>\n\n\n\n<li><strong>Imaging reference:<\/strong> Sacroiliitis on X-ray or MRI documented, or prior imaging cited<\/li>\n\n\n\n<li><strong>HLA-B27 status:<\/strong> Test result referenced where available. Not required for coding but strengthens clinical support<\/li>\n\n\n\n<li><strong>Symptom duration:<\/strong> Chronic, inflammatory nature noted (not acute mechanical back pain)<\/li>\n\n\n\n<li><strong>Treatment context:<\/strong> NSAIDs, biologic therapy, or physical therapy referenced, indicating confirmed diagnosis management<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Their documentation of functional limitations in the lumbosacral region can support the physician&#8217;s diagnosis code. Use digital intake and forms to standardize the capture of anatomical site and symptom history at every visit, reducing the back-and-forth of physician queries.<\/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-m457\/customizable-consent-and-intake-forms.webp\" alt=\"Customizable consent and intake forms\"\/><figcaption class=\"wp-element-caption\"><em>Customizable consent and intake forms<\/em><\/figcaption><\/figure>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n        <div id=\"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 across your practice                <\/h3>\n\n                <p class=\"description\">\n                    Pabau helps musculoskeletal and rheumatology practices manage patient records, streamline claims workflows, and capture the clinical documentation detail that supports accurate ICD-10 coding from the first submission.                <\/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-commonly-associated-and-comorbid-icd-10-codes-with-m45-7\" class=\"wp-block-heading\">Commonly associated and comorbid ICD-10 codes with M45.7<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">AS rarely presents in isolation. Coders working on rheumatology claims regularly encounter the diagnoses below alongside M45.7. The <a href=\"https:\/\/www.aapc.com\/codes\/icd-10-codes-range\/\" target=\"_blank\" rel=\"nofollow noopener\">AAPC ICD-10-CM code reference<\/a> notes comorbidity patterns for inflammatory spondylopathies that billing staff should recognize. Practices supporting chiropractic and spinal management encounter several of these secondary codes routinely.<\/p>\n\n\n\n<table style=\"width:100%;border-collapse:separate;border-spacing:0;border-radius:12px;overflow:hidden;font-size:15px;line-height:1.5;margin:1.5em 0 2em;box-shadow:0 2px 12px rgba(0,0,0,0.08)\">\n<thead>\n<tr>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">ICD-10 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\">Coding note<\/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\">M46.1<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Sacroiliitis, not elsewhere classified<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Common comorbid; code separately when documented as a distinct finding<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">L40.5x<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Psoriatic arthropathy<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Code when psoriasis and arthritis are both documented; AS and psoriatic SpA may coexist<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">H20.00<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Iridocyclitis (uveitis), unspecified<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Extra-articular manifestation of AS; document and code separately<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">M77.30<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Calcaneal spur, unspecified foot<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Enthesitis is a hallmark SpA feature; code at the specific anatomical site<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Z79.620<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Long term (current) use of immunosuppressive biologic<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Use for biologic\/TNF-inhibitor therapy for AS, effective October 1, 2025. Reserve Z79.899 for cases where no more specific Z79.6x code applies<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<h2 id=\"h-differential-diagnosis-coding-m45-7-vs-similar-codes\" class=\"wp-block-heading\">Differential diagnosis coding: M45.7 vs similar codes<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is where the most preventable coding errors occur. The lumbosacral spine is coded under several overlapping categories depending on the nature of inflammation, patient age, and underlying etiology. The comparison below addresses the cases coders find most ambiguous. A chiropractic billing cheat sheet covering CPT and ICD-10 codes can help coders build the same pattern recognition across other musculoskeletal condition families.<\/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\">Use when&#8230;<\/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\">Do NOT use when&#8230;<\/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\">M45.7<\/td>\n<td style=\"padding:12px 16px;color:#374151\">AS of lumbosacral region<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Confirmed AS with lumbosacral site explicitly documented<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Site is unspecified or involves cervical\/thoracic regions only<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">M45.9<\/td>\n<td style=\"padding:12px 16px;color:#374151\">AS of unspecified sites<\/td>\n<td style=\"padding:12px 16px;color:#374151\">AS is confirmed but clinical note does not specify anatomical region<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Region is documented; M45.7 (or another site-specific subcode) is then required<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">M46.1<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Sacroiliitis, not elsewhere classified<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Sacroiliitis without confirmed AS diagnosis<\/td>\n<td style=\"padding:12px 16px;color:#374151\">AS has been confirmed; M45.7 takes precedence, M46.1 added if sacroiliitis separately 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\">M47.26<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Other spondylosis with radiculopathy, lumbar region<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Degenerative spondylosis with radicular symptoms in lumbar spine<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Inflammatory ankylosing spondylitis; degenerative and inflammatory etiologies are distinct<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">M08.1<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Juvenile ankylosing spondylitis<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Patient is under 16 with juvenile-onset AS<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Adult-onset AS; use M45 family for adults<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">The most frequent error is using M45.9 when the physician has documented the lumbosacral region but the coder defaults to unspecified. The same specificity rule applies well beyond musculoskeletal codes: <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the site is documented, it must be coded. Equip your team with patient records and notes tools that surface this information at the point of coding.<\/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-m457\/comprehensive-patient-records.webp\" alt=\"Comprehensive patient records\"\/><figcaption class=\"wp-element-caption\"><em>Comprehensive patient records<\/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>Run a monthly audit of your M45.9 claims. Any case where the physician note documents a specific spinal region is a candidate for query and potential code correction to the appropriate site-specific subcode. Reducing unspecified code usage improves audit defensibility and often increases reimbursement.<\/p>\n            <\/div>\n        <\/div>\n    \n\n\n<h2 id=\"h-icd-10-code-history-and-annual-updates-for-m45-7\" class=\"wp-block-heading\">ICD-10 code history and annual updates for M45.7<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">M45.7 has been a stable, valid code across recent ICD-10-CM fiscal years. No description changes or retirements have been recorded for this subcode in the annual CMS update files. Its current status is confirmed for FY2026 by the <a href=\"https:\/\/icd10cmtool.cdc.gov\/\" target=\"_blank\" rel=\"nofollow noopener\">CDC\/NCHS ICD-10-CM web tool<\/a>.<\/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\">Fiscal Year<\/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\">Status<\/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 changes<\/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\">FY2026 (effective Oct 1, 2025)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Valid and billable<\/td>\n<td style=\"padding:12px 16px;color:#374151\">None<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">FY2025<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Valid and billable<\/td>\n<td style=\"padding:12px 16px;color:#374151\">None<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">FY2024<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Valid and billable<\/td>\n<td style=\"padding:12px 16px;color:#374151\">None<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">Practices coding AS claims should verify the annual CMS ICD-10-CM update files each October. While M45.7 has remained stable, adjacent codes in the M46 and M47 blocks have seen periodic revisions. Clinical exam references like the Noble compression test guide can help support the physical findings documented for related musculoskeletal conditions.<\/p>\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-m458\/\">ICD-10 Code M45.8 \u2014 Ankylosing spondylitis of the sacral region<\/a><\/li>\n\n\n<li><a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-m459\/\">ICD-10 M45.9 \u2014 Ankylosing spondylitis, unspecified spine<\/a><\/li>\n\n\n<li><a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-m4606\/\">ICD-10 code M46.06 \u2014 Spinal Enthesopathy, Lumbar Region<\/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\">Ankylosing spondylitis claims fail when the lumbosacral site is documented but not coded. ICD-10 Code M45.7 is the correct, billable code for confirmed AS affecting the lumbosacral region, valid through FY2026 and unchanged from prior years. The M45.7 vs M45.9 choice comes down to a single question: did the physician specify the anatomical region?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pabau, practice management software for rheumatology and musculoskeletal teams, helps capture anatomical site data at the point of care, closing the missing documentation details that cause avoidable denials. <a href=\"https:\/\/pabau.com\/book-demo\/\">Book a demo<\/a> to see how Pabau supports accurate diagnostic coding workflows.<\/p>\n\n\n        <div id=\"expert_picks\">\n            <div class=\"header\">\n                                    <img decoding=\"async\" src=\"https:\/\/pabau.com\/wp-content\/uploads\/2025\/11\/Expert-Picks.svg\" alt=\"Continue your research\" height=\"42\" width=\"42\">\n                                <h3>Continue your research<\/h3>\n            <\/div>\n            <div class=\"content\">\n                                                            <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#54B2D3\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p><strong>Managing billing compliance across a musculoskeletal practice?<\/strong> <a href=\"https:\/\/pabau.com\/blog\/mandatory-compliance-for-physiotherapy-clinics\/\" target=\"_blank\" rel=\"noopener\">Physiotherapy compliance guide<\/a> covers the documentation and regulatory requirements that apply to spinal and musculoskeletal practice settings.<\/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 a consistent format for clinical documentation?<\/strong> <a href=\"https:\/\/pabau.com\/templates\/apso-note-template\/\" target=\"_blank\" rel=\"noopener\">APSO note template<\/a> gives rheumatology and musculoskeletal teams a structured way to record assessment, plan, subjective, and objective findings.<\/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>Looking for another musculoskeletal billing reference?<\/strong> CPT <a href=\"https:\/\/pabau.com\/procedure-codes\/cpt-code-11047\/\" target=\"_blank\" rel=\"noopener\">11047<\/a> covers the add-on billing rules for bone debridement 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-1784718654381\"><h3 class=\"schema-faq-question\">What is ICD-10 Code M45.7?<\/h3> <p class=\"schema-faq-answer\">ICD-10 Code M45.7 is a billable ICD-10-CM diagnosis code for ankylosing spondylitis of the lumbosacral region. It is a site-specific subcode of the M45 parent category (ankylosing spondylitis), valid for FY2026 with an effective date of October 1, 2025. Clinicians and coders use it when a confirmed AS diagnosis specifically involves the lumbosacral spine.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1784718654382\"><h3 class=\"schema-faq-question\">Is M45.7 a billable ICD-10-CM code?<\/h3> <p class=\"schema-faq-answer\">Yes, M45.7 is a billable, specific ICD-10-CM code valid for reimbursement purposes. The parent code M45 is not billable on its own; payers require a site-specific subcode such as M45.7 to process claims for ankylosing spondylitis.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1784718654383\"><h3 class=\"schema-faq-question\">What is the difference between M45.7 and M45.9?<\/h3> <p class=\"schema-faq-answer\">M45.7 specifies ankylosing spondylitis of the lumbosacral region, while M45.9 is used when the anatomical site is unspecified. If the physician&#8217;s note identifies the lumbosacral region, M45.7 is the correct and more specific code. M45.9 should only be used when no spinal region is documented.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1784718654384\"><h3 class=\"schema-faq-question\">What is the difference between ankylosing spondylitis and axial spondyloarthritis in ICD-10?<\/h3> <p class=\"schema-faq-answer\">Ankylosing spondylitis (AS) is the radiographic form of axial spondyloarthritis (axSpA), confirmed by imaging evidence of sacroiliitis, and is coded within the M45 category. Non-radiographic axSpA has its own dedicated subcategory, M45.A, with site-specific billable subcodes such as M45.A7 for the lumbosacral region. It is not coded to M45.9 or M46.9. The M45.A subcodes coexist alongside the radiographic AS codes in the M45 family that this article covers.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1784718654385\"><h3 class=\"schema-faq-question\">What conditions are excluded from ICD-10 code M45?<\/h3> <p class=\"schema-faq-answer\">The M45 category excludes juvenile ankylosing spondylitis (M08.1), arthropathy in Reiter&#8217;s disease (M02.3), and Behcet&#8217;s disease (M35.2). These are coded to their own specific categories and must not be coded under M45 or any of its subcodes including M45.7.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1784718654386\"><h3 class=\"schema-faq-question\">When did ICD-10 code M45.7 become effective?<\/h3> <p class=\"schema-faq-answer\">ICD-10 Code M45.7 became effective October 1, 2025 under the FY2026 edition of ICD-10-CM. The code has been valid in prior fiscal years as well, with no description changes recorded in recent annual updates.<\/p> <\/div> <\/div>\n","protected":false},"excerpt":{"rendered":"<p>ICD-10 Code M45.7 is a billable, site-specific ICD-10-CM diagnosis code for ankylosing spondylitis of the lumbosacral region, valid for FY2026 with an effective date of October 1, 2025. M45.7 sits within the M45 parent category, which covers ankylosing spondylitis across all spinal regions, and within the broader M40-M54 dorsopathies block. The CDC\/NCHS ICD-10-CM tool confirms [&hellip;]<\/p>\n","protected":false},"author":77,"featured_media":161404,"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":[1386,1305,2635],"class_list":["post-161408","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-diagnostic-codes","category-icd-10-cm","tag-icd","tag-icd-10-codes","tag-rheumatology-coding"],"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 M45.7: Ankylosing spondylitis of lumbosacral region<\/title>\n<meta name=\"description\" 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is an all-in-one healthcare practice management software platform designed for clinics, medspas, therapists, and medical professionals. It combines scheduling, electronic health records, clinical forms, payments, marketing automation, reporting, and patient engagement tools into one secure cloud system to help practices streamline operations and grow their business.\",\"foundingDate\":\"2011-10-20\",\"numberOfEmployees\":{\"@type\":\"QuantitativeValue\",\"minValue\":\"201\",\"maxValue\":\"500\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/#\\\/schema\\\/person\\\/5de22f4ff3ec59b1925ef02dce956d7d\",\"name\":\"Katy Piper\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"es\",\"@id\":\"https:\\\/\\\/pabau.com\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/cropped-Snip20260306_177-96x96.png\",\"url\":\"https:\\\/\\\/pabau.com\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/cropped-Snip20260306_177-96x96.png\",\"contentUrl\":\"https:\\\/\\\/pabau.com\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/cropped-Snip20260306_177-96x96.png\",\"caption\":\"Katy Piper\"},\"description\":\"Katy Piper is a content writer covering aesthetics, dermatology, and clinic operations, with a knack for making clinical detail feel approachable. Outside of work, she's usually chasing her border collie around muddy fields or hunting down the best flat white in town.\",\"url\":\"https:\\\/\\\/pabau.com\\\/es\\\/blog\\\/author\\\/katy-piper\\\/\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m457\\\/#faq-question-1784718654381\",\"position\":1,\"url\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m457\\\/#faq-question-1784718654381\",\"name\":\"What is ICD-10 Code M45.7?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"ICD-10 Code M45.7 is a billable ICD-10-CM diagnosis code for ankylosing spondylitis of the lumbosacral region. It is a site-specific subcode of the M45 parent category (ankylosing spondylitis), valid for FY2026 with an effective date of October 1, 2025. Clinicians and coders use it when a confirmed AS diagnosis specifically involves the lumbosacral spine.\",\"inLanguage\":\"es\"},\"inLanguage\":\"es\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m457\\\/#faq-question-1784718654382\",\"position\":2,\"url\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m457\\\/#faq-question-1784718654382\",\"name\":\"Is M45.7 a billable ICD-10-CM code?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, M45.7 is a billable, specific ICD-10-CM code valid for reimbursement purposes. The parent code M45 is not billable on its own; payers require a site-specific subcode such as M45.7 to process claims for ankylosing spondylitis.\",\"inLanguage\":\"es\"},\"inLanguage\":\"es\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m457\\\/#faq-question-1784718654383\",\"position\":3,\"url\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m457\\\/#faq-question-1784718654383\",\"name\":\"What is the difference between M45.7 and M45.9?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"M45.7 specifies ankylosing spondylitis of the lumbosacral region, while M45.9 is used when the anatomical site is unspecified. If the physician's note identifies the lumbosacral region, M45.7 is the correct and more specific code. M45.9 should only be used when no spinal region is documented.\",\"inLanguage\":\"es\"},\"inLanguage\":\"es\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m457\\\/#faq-question-1784718654384\",\"position\":4,\"url\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m457\\\/#faq-question-1784718654384\",\"name\":\"What is the difference between ankylosing spondylitis and axial spondyloarthritis in ICD-10?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Ankylosing spondylitis (AS) is the radiographic form of axial spondyloarthritis (axSpA), confirmed by imaging evidence of sacroiliitis, and is coded within the M45 category. Non-radiographic axSpA has its own dedicated subcategory, M45.A, with site-specific billable subcodes such as M45.A7 for the lumbosacral region. It is not coded to M45.9 or M46.9. The M45.A subcodes coexist alongside the radiographic AS codes in the M45 family that this article covers.\",\"inLanguage\":\"es\"},\"inLanguage\":\"es\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m457\\\/#faq-question-1784718654385\",\"position\":5,\"url\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m457\\\/#faq-question-1784718654385\",\"name\":\"What conditions are excluded from ICD-10 code M45?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The M45 category excludes juvenile ankylosing spondylitis (M08.1), arthropathy in Reiter's disease (M02.3), and Behcet's disease (M35.2). These are coded to their own specific categories and must not be coded under M45 or any of its subcodes including M45.7.\",\"inLanguage\":\"es\"},\"inLanguage\":\"es\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m457\\\/#faq-question-1784718654386\",\"position\":6,\"url\":\"https:\\\/\\\/pabau.com\\\/es\\\/diagnostic-codes\\\/icd-10-code-m457\\\/#faq-question-1784718654386\",\"name\":\"When did ICD-10 code M45.7 become effective?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"ICD-10 Code M45.7 became effective October 1, 2025 under the FY2026 edition of ICD-10-CM. 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