2026 ICD-10-CM Diagnosis Code M45Ankylosing spondylitis
M45 is a non-billable ICD-10-CM category code for ankylosing spondylitis, so it cannot be submitted on claims. Use a more specific code from this category instead, such as M45.0, M45.1, M45.2, and M45.3.
Code Identity
Code Classification
Specific Coding for Ankylosing spondylitisOverview
Non-specific codes like M45 require more characters. Use one of these billable codes instead:
Use M45.0 for Ankylosing spondylitis of multiple sites in spine
Use M45.1 for Ankylosing spondylitis of occipito-atlanto-axial region
Use M45.2 for Ankylosing spondylitis of cervical region
Use M45.3 for Ankylosing spondylitis of cervicothoracic region
Use M45.4 for Ankylosing spondylitis of thoracic region
Use M45.5 for Ankylosing spondylitis of thoracolumbar region
Use M45.6 for Ankylosing spondylitis lumbar region
Use M45.7 for Ankylosing spondylitis of lumbosacral region
Use M45.8 for Ankylosing spondylitis sacral and sacrococcygeal region
Use M45.9 for Ankylosing spondylitis of unspecified sites in spine
M45.A for Non-radiographic axial spondyloarthritis
Use M45.A0 for Non-radiographic axial spondyloarthritis of unspecified sites in spine
Use M45.A1 for Non-radiographic axial spondyloarthritis of occipito-atlanto-axial region
Use M45.A2 for Non-radiographic axial spondyloarthritis of cervical region
Use M45.A3 for Non-radiographic axial spondyloarthritis of cervicothoracic region
Use M45.A4 for Non-radiographic axial spondyloarthritis of thoracic region
Use M45.A5 for Non-radiographic axial spondyloarthritis of thoracolumbar region
Use M45.A6 for Non-radiographic axial spondyloarthritis of lumbar region
Use M45.A7 for Non-radiographic axial spondyloarthritis of lumbosacral region
Use M45.A8 for Non-radiographic axial spondyloarthritis of sacral and sacrococcygeal region
Use M45.AB for Non-radiographic axial spondyloarthritis of multiple sites in spine
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Rheumatoid arthritis of spine
Type 1 Excludes
Type 2 Excludes
- Behçet's disease M35.2
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Patient EducationClinical
Ankylosing Spondylitis
Ankylosing spondylitis (AS) is a type of arthritis of the spine. It causes inflammation (swelling) between your vertebrae (the bones that make up your spine) and the joints between your spine and pelvis. AS inflammation can cause stiffness and make it difficult to move and bend.
The full article covers:
- What is ankylosing spondylitis?
- Who is more likely to get ankylosing spondylitis?
- What causes ankylosing spondylitis?
- What are the symptoms of ankylosing spondylitis?
- How is ankylosing spondylitis diagnosed?
- What are the treatments for ankylosing spondylitis?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
