M18
Header — not billableOsteoarthritis of first carpometacarpal joint
The ICD-10 code for osteoarthritis of first carpometacarpal joint is M18.
M18 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 7 more specific codes below.
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Child codes under M18
- M18.0Bilateral primary osteoarthritis of first carpometacarpal joints
- M18.1Unilateral primary osteoarthritis of first carpometacarpal jointnon-billable header
- M18.2Bilateral post-traumatic osteoarthritis of first carpometacarpal joints
- M18.3Unilateral post-traumatic osteoarthritis of first carpometacarpal jointnon-billable header
- M18.4Other bilateral secondary osteoarthritis of first carpometacarpal joints
- M18.5Other unilateral secondary osteoarthritis of first carpometacarpal jointnon-billable header
- M18.9Osteoarthritis of first carpometacarpal joint, unspecified
Related codes in this category
- M15Polyosteoarthritisnon-billable header
- M16Osteoarthritis of hipnon-billable header
- M17Osteoarthritis of kneenon-billable header
- M19Other and unspecified osteoarthritisnon-billable header
- M18Osteoarthritis of first carpometacarpal jointnon-billable header