Osteoarthritis of first carpometacarpal joint

This code exists but cannot be submitted on its own. It groups the more specific codes beneath it.

A category header for its whole life, FY2016 onwards. It has never been valid for submission on its own.

Submit one of these 7 more specific codes instead:

• M18.0 Bilateral primary osteoarthritis of first carpometacarpal joints
• M18.1 Unilateral primary osteoarthritis of first carpometacarpal joint (also a header)
• M18.2 Bilateral post-traumatic osteoarthritis of first carpometacarpal joints
• M18.3 Unilateral post-traumatic osteoarthritis of first carpometacarpal joint (also a header)
• M18.4 Other bilateral secondary osteoarthritis of first carpometacarpal joints
• M18.5 Other unilateral secondary osteoarthritis of first carpometacarpal joint (also a header)
• M18.9 Osteoarthritis of first carpometacarpal joint, unspecified