| Full description | Unilateral primary osteoarthritis of first carpometacarpal joint, left hand |
| Billable | Yes |
| Chapter | Chapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99) |
| Section | Osteoarthritis (M15-M19) |
| Parent code | M18.1 — Unilateral primary osteoarth of first carpometacarp joint |