M: Musculo-skeletal system
| Level 2 code | Description |
|---|---|
| M01 | Antiinflammatory and antirheumatic products |
| M02 | Topical products for joint and muscular pain |
| M03 | Muscle relaxants |
| M04 | Antigout preparations |
| M05 | Drugs for treatment of bone diseases |
| M09 | Other drugs for disorders of the musculo-skeletal system |