| Full description | Idiopathic chronic gout, unspecified knee, with tophus (tophi) |
| Billable | Yes |
| Chapter | Chapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99) |
| Section | Inflammatory polyarthropathies (M05-M14) |
| Parent code | M1A.069 — Idiopathic chronic gout, unspecified knee |