Section M45-M49Spondylopathies
  1. M45 Ankylosing spondylitis

    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

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.