M18.10: Unilateral primary osteoarthritis of first carpometacarpal joint, unspecified hand
M18.10 is the billable ICD-10-CM diagnosis code for Unilateral primary osteoarthritis of first carpometacarpal joint, unspecified hand. It is a fully specified code, so it can be reported on a claim (subject to clinical documentation and your payer's rules).
Frequently asked questions
What is ICD-10-CM code M18.10?
M18.10 is the ICD-10-CM diagnosis code for Unilateral primary osteoarthritis of first carpometacarpal joint, unspecified hand. It belongs to category M18 (Osteoarthritis of first carpometacarpal joint).
Is M18.10 a billable code?
Yes. M18.10 is a billable, fully specified ICD-10-CM code, so it can be used on a claim (subject to documentation and payer rules).
What category does M18.10 belong to?
M18.10 is part of ICD-10-CM category M18 — Osteoarthritis of first carpometacarpal joint, which has 26 billable codes.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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