WHAT THE CEAP ACRONYM STANDS FOR C = clinical condition E = etiology A = anatomic location P = pathophysiology WHAT IS CEAP CLASSIFICATION? The American Venous Forum wrote the first CEAP classification in 1994. It provides a comprehensive classification that’s accepted worldwide. Most published medical papers now use all or portions of the CEAP system. It has two parts: classification and severity scoring of lower extremity vein disease. CEAP classification ranges from C0 (no venous disease) to C6 (an open and active ulcer). Today, all healthcare professionals use the CEAP system when describing vein disease. It’s designed to be very specific. In short, it offers everything that the previous system failed to do.