Section M45-M49Spondylopathies
  1. M45 Ankylosing spondylitis

    Inclusion term(s):

    • Rheumatoid arthritis of spine

    Excludes1

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

    Excludes2

    • Behçet's disease (M35.2)
    1. M45.0 Ankylosing spondylitis of multiple sites in spine

    2. M45.1 Ankylosing spondylitis of occipito-atlanto-axial region

    3. M45.2 Ankylosing spondylitis of cervical region

    4. M45.3 Ankylosing spondylitis of cervicothoracic region

    5. M45.4 Ankylosing spondylitis of thoracic region

    6. M45.5 Ankylosing spondylitis of thoracolumbar region

    7. M45.6 Ankylosing spondylitis lumbar region

    8. M45.7 Ankylosing spondylitis of lumbosacral region

    9. M45.8 Ankylosing spondylitis sacral and sacrococcygeal region

    10. M45.9 Ankylosing spondylitis of unspecified sites in spine

    11. M45.A Non-radiographic axial spondyloarthritis

      1. M45.A0 Non-radiographic axial spondyloarthritis of unspecified sites in spine

      2. M45.A1 Non-radiographic axial spondyloarthritis of occipito-atlanto-axial region

      3. M45.A2 Non-radiographic axial spondyloarthritis of cervical region

      4. M45.A3 Non-radiographic axial spondyloarthritis of cervicothoracic region

      5. M45.A4 Non-radiographic axial spondyloarthritis of thoracic region

      6. M45.A5 Non-radiographic axial spondyloarthritis of thoracolumbar region

      7. M45.A6 Non-radiographic axial spondyloarthritis of lumbar region

      8. M45.A7 Non-radiographic axial spondyloarthritis of lumbosacral region

      9. M45.A8 Non-radiographic axial spondyloarthritis of sacral and sacrococcygeal region

      10. M45.AB Non-radiographic axial spondyloarthritis of multiple sites in spine

Abbreviations used here:

NEC Not elsewhere classifiable
This abbreviation in the Tabular List represents “other specified”. When a specific code is not available for a condition, the Tabular List includes an NEC entry under a code to identify the code as the “other specified” code.

NOS Not otherwise specified
This abbreviation is the equivalent of unspecified.