M18
M18: Osteoarthritis of first carpometacarpal joint
Non-billable headerICD-10-CM
M18 is a non-billable header ICD-10-CM code for osteoarthritis of first carpometacarpal joint. It cannot be billed on its own: choose one of the more specific child codes below.
Other codes that can never be billed with M18
Their own Excludes1 notes name this code, so the conflict is not listed above.
- M12.5Traumatic arthropathy
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Code history
Unchanged in every release from FY2024 to FY2027.
Code to one of these instead M18
7 child codes. Green means billable.
- M18.0Bilateral primary osteoarthritis of first carpometacarpal joints
- M18.1Unilateral primary osteoarthritis of first carpometacarpal joint
- M18.2Bilateral post-traumatic osteoarthritis of first carpometacarpal joints
- M18.3Unilateral post-traumatic osteoarthritis of first carpometacarpal joint
- M18.4Other bilateral secondary osteoarthritis of first carpometacarpal joints
- M18.5Other unilateral secondary osteoarthritis of first carpometacarpal joint
- M18.9Osteoarthritis of first carpometacarpal joint, unspecified