| CO | No visible or palpable signs of venous disease |
| C1 | Telangiectasies or reticular veins |
| C2 | Varicose veins |
| C3 | Edema |
| C4a | Pigmentation or eczema |
| C4b | Lipodermatosclerosis or atrophy blanche |
| C5 | Healed venous ulcers |
| C6 | Active venous ulcers |
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