Ankylosing spondylitis (M45)

Browse all the diagnosis codes used for ankylosing spondylitis (m45). For easy navigation, the diagnosis codes are sorted in alphabetical order and grouped by sections. Each section is clearly marked with its description, and the corresponding three-digit code range. This format makes it simple to browse diagnosis codes in this chapter or section and find what you're looking for. We've also added green checkmark icons to label billable codes, and red warning icons for non-billable ones. This makes it easy to identify which codes can be billed.

Clinical Information

Axial Spondyloarthritis - A spectrum of chronic inflammatory conditions affecting the axial joints (e.g., SPINE), characterized by pain, stiffness of joints (ANKYLOSIS), reduced mobility and inflammation. When joint inflammation and damage are visible on regular X-rays it is called ANKYLOSING SPONDYLITIS; otherwise it is referred to as NON-RADIOGRAPHIC AXIAL SPONDYLOARTHRITIS. HLA-B27 ANTIGEN is a biomarker and IL-23/IL-17 pathway a potential therapeutic target for axial and other related spondyloarthritis.

Non-Radiographic Axial Spondyloarthritis - Chronic inflammatory conditions affecting the axial joints which cannot be detectable on x-rays. It is characterized by pain, stiffness of joints and inflammation. Non-radiographic axial spondyloarthritis can have symptoms onset before the age of 45 and progress to more severe ANKYLOSING SPONDYLITIS over time.

Instructional Notations

Inclusion Terms

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.

  • Rheumatoid arthritis of spine

Type 1 Excludes

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.

  • arthropathy in Reiter's disease M02.3
  • juvenile ankylosing spondylitis M08.1

Type 2 Excludes

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.

  • Behçet's disease M35.2
  • Diseases of the musculoskeletal system and connective tissue (M00–M99)

    • Spondylopathies (M45-M49)

        • Ankylosing spondylitis (M45)

        • M45 Ankylosing spondylitis
        • M45.0 Ankylosing spondylitis of multiple sites in spine
        • M45.1 Ankylosing spondylitis of occipito-atlanto-axial region
        • M45.2 Ankylosing spondylitis of cervical region
        • M45.3 Ankylosing spondylitis of cervicothoracic region
        • M45.4 Ankylosing spondylitis of thoracic region
        • M45.5 Ankylosing spondylitis of thoracolumbar region
        • M45.6 Ankylosing spondylitis lumbar region
        • M45.7 Ankylosing spondylitis of lumbosacral region
        • M45.8 Ankylosing spondylitis sacral and sacrococcygeal region
        • M45.9 Ankylosing spondylitis of unspecified sites in spine
        • M45.A Non-radiographic axial spondyloarthritis
        • M45.A0 Non-radiographic axial spondyloarthritis of unspecified sites in spine
        • M45.A1 Non-radiographic axial spondyloarthritis of occipito-atlanto-axial region
        • M45.A2 Non-radiographic axial spondyloarthritis of cervical region
        • M45.A3 Non-radiographic axial spondyloarthritis of cervicothoracic region
        • M45.A4 Non-radiographic axial spondyloarthritis of thoracic region
        • M45.A5 Non-radiographic axial spondyloarthritis of thoracolumbar region
        • M45.A6 Non-radiographic axial spondyloarthritis of lumbar region
        • M45.A7 Non-radiographic axial spondyloarthritis of lumbosacral region
        • M45.A8 Non-radiographic axial spondyloarthritis of sacral and sacrococcygeal region
        • M45.AB Non-radiographic axial spondyloarthritis of multiple sites in spine