| M18 | Osteoarthritis of first carpometacarpal joint |
| | Bilateral primary osteoarthritis of first carpometacarpal joints |
| | Unilateral primary osteoarthritis of first carpometacarpal joint |
| | Unilateral primary osteoarthritis of first carpometacarpal joint, unspecified hand |
| | Unilateral primary osteoarthritis of first carpometacarpal joint, right hand |
| | Unilateral primary osteoarthritis of first carpometacarpal joint, left hand |
| | Bilateral post-traumatic osteoarthritis of first carpometacarpal joints |
| | Unilateral post-traumatic osteoarthritis of first carpometacarpal joint |
| | Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, unspecified hand |
| | Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, right hand |
| | Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, left hand |
| | Other bilateral secondary osteoarthritis of first carpometacarpal joints |
| | Other unilateral secondary osteoarthritis of first carpometacarpal joint |
| | Other unilateral secondary osteoarthritis of first carpometacarpal joint, unspecified hand |
| | Other unilateral secondary osteoarthritis of first carpometacarpal joint, right hand |
| | Other unilateral secondary osteoarthritis of first carpometacarpal joint, left hand |
| | Osteoarthritis of first carpometacarpal joint, unspecified |
