C: Cardiovascular system
| Level 2 code | Description |
|---|---|
| C01 | Cardiac therapy |
| C02 | Antihypertensives |
| C03 | Diuretics |
| C04 | Peripheral vasodilators |
| C05 | Vasoprotectives |
| C07 | Beta blocking agents |
| C08 | Calcium channel blockers |
| C09 | Agents acting on the renin-angiotensin system |
| C10 | Lipid modifying agents |