M45.9Billable
Ankylosing spondylitis of unspecified sites in spine
- Chapter
- 13. Diseases of the musculoskeletal system and connective tissue
- Category
- M45
- Effective date
- October 1, 2026
Related codes in category M45
M45Ankylosing spondylitisM45.0Ankylosing spondylitis of multiple sites in spineYesM45.1Ankylosing spondylitis of occipito-atlanto-axial regionYesM45.2Ankylosing spondylitis of cervical regionYesM45.3Ankylosing spondylitis of cervicothoracic regionYesM45.4Ankylosing spondylitis of thoracic regionYesM45.5Ankylosing spondylitis of thoracolumbar regionYesM45.6Ankylosing spondylitis lumbar regionYesM45.7Ankylosing spondylitis of lumbosacral regionYesM45.8Ankylosing spondylitis sacral and sacrococcygeal regionYesM45.ANon-radiographic axial spondyloarthritisM45.A0Non-radiographic axial spondyloarthritis unsp site in spinYes
Frequently asked questions
What is ICD-10 code M45.9?
M45.9 is an ICD-10-CM diagnosis code for Ankylosing spondylitis of unspecified sites in spine.
Is M45.9 a billable code?
Yes. M45.9 is billable and specific enough to be used on a claim.
What ICD-10-CM chapter is M45.9 in?
M45.9 falls under Chapter 13: Diseases of the musculoskeletal system and connective tissue.
When did M45.9 become effective?
M45.9 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to M45.9?
M45.9 belongs to category M45, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.