| Sub Class | Description |
|---|---|
| S01A | Based on sNgo-khrog (plants) |
| S01B | Based on Srog-Chhags (animals) |
| S01C | Pharmaceutical preparations based on Rin-Po-Chhe-dang-Sa-rDohi-sMan (minerals) and inorganic/organic ingredients. |
| S01D | Characterised by Nad (Disease) |
| S01E | Characterised by Las (Action) |
| S01F | Drug Administration |
| S01G | Miscellaneous TKRC Codes |
| S01H | Characterised by physical form. |