| Full description | Derangement of anterior horn of medial meniscus due to old tear or injury, right knee |
| Billable | Yes |
| Chapter | Chapter 13: Diseases of the musculoskeletal system and connective tissue (M00-M99) |
| Section | Other joint disorders (M20-M25) |
| Parent code | M23.21 — Derang of ant horn of medial meniscus due to old tear/inj |