M45: Ankylosing spondylitis

Codes under M45 (Ankylosing spondylitis). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.

Code	Description	Billable
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	✓

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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.

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