ICD-10-CM · Chapter 13 · M00-M99
M18 Osteoarthritis of first carpometacarpal joint
Subcodes
Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.
| Code | Description | Billable |
|---|---|---|
| M18..0 | Bilateral primary osteoarthritis of first carpometacarpal joints | Yes |
| M18..1 | Unilateral primary osteoarthritis of first carpometacarpal joint | No |
| M18..10 | Unilateral primary osteoarthritis of first carpometacarpal joint, unspecified hand | Yes |
| M18..11 | Unilateral primary osteoarthritis of first carpometacarpal joint, right hand | Yes |
| M18..12 | Unilateral primary osteoarthritis of first carpometacarpal joint, left hand | Yes |
| M18..2 | Bilateral post-traumatic osteoarthritis of first carpometacarpal joints | Yes |
| M18..3 | Unilateral post-traumatic osteoarthritis of first carpometacarpal joint | No |
| M18..30 | Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, unspecified hand | Yes |
| M18..31 | Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, right hand | Yes |
| M18..32 | Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, left hand | Yes |
| M18..4 | Other bilateral secondary osteoarthritis of first carpometacarpal joints | Yes |
| M18..5 | Other unilateral secondary osteoarthritis of first carpometacarpal joint | No |
| M18..50 | Other unilateral secondary osteoarthritis of first carpometacarpal joint, unspecified hand | Yes |
| M18..51 | Other unilateral secondary osteoarthritis of first carpometacarpal joint, right hand | Yes |
| M18..52 | Other unilateral secondary osteoarthritis of first carpometacarpal joint, left hand | Yes |
| M18..9 | Osteoarthritis of first carpometacarpal joint, unspecified | Yes |
Last reviewed: September 2026