M45.5

Ankylosing spondylitis of multiple sites in spine

Ankylosing spondylitis of occipito-atlanto-axial region

Ankylosing spondylitis of cervical region

Ankylosing spondylitis of cervicothoracic region

Ankylosing spondylitis of thoracic region

Ankylosing spondylitis lumbar region

Ankylosing spondylitis of lumbosacral region

Ankylosing spondylitis sacral and sacrococcygeal region

Ankylosing spondylitis of unspecified sites in spine

Non-radiographic axial spondyloarthritis