| ICD-10 Code | Description |
| 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.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 |
