M46.21Billable
Osteomyelitis of vertebra, occipito-atlanto-axial region
- Chapter
- 13. Diseases of the musculoskeletal system and connective tissue
- Category
- M46
- Effective date
- October 1, 2026
Related codes in category M46
M46Other inflammatory spondylopathiesM46.0Spinal enthesopathyM46.00Spinal enthesopathy, site unspecifiedYesM46.01Spinal enthesopathy, occipito-atlanto-axial regionYesM46.02Spinal enthesopathy, cervical regionYesM46.03Spinal enthesopathy, cervicothoracic regionYesM46.04Spinal enthesopathy, thoracic regionYesM46.05Spinal enthesopathy, thoracolumbar regionYesM46.06Spinal enthesopathy, lumbar regionYesM46.07Spinal enthesopathy, lumbosacral regionYesM46.08Spinal enthesopathy, sacral and sacrococcygeal regionYesM46.09Spinal enthesopathy, multiple sites in spineYes
Frequently asked questions
What is ICD-10 code M46.21?
M46.21 is an ICD-10-CM diagnosis code for Osteomyelitis of vertebra, occipito-atlanto-axial region.
Is M46.21 a billable code?
Yes. M46.21 is billable and specific enough to be used on a claim.
What ICD-10-CM chapter is M46.21 in?
M46.21 falls under Chapter 13: Diseases of the musculoskeletal system and connective tissue.
When did M46.21 become effective?
M46.21 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to M46.21?
M46.21 belongs to category M46, 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.