M45 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Ankylosing spondylitis.
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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 of thoracolumbar 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
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