Clinical* classification
C0 No visible or palpable signs of venous disease
C1 Telangiectases or reticular veins
C2 Varicose veins
C3 Edema
C4a Pigmentation and/or eczema
C4b Lipodermatosclerosis and/or atrophie blanche
C5 Healed venous ulcer
C6 Active venous ulcer
Etiologic classification
Ec Congenital
Ep Primary
Es Secondary (post-thrombotic)
En No venous etiology identified
Anatomic* classification
As Superficial veins
Ap Perforator veins
Ad Deep veins
As,p Superficial veins
As,p Perforator veins
As,p,d Superficial veins
As,p,d Perforator veins
As,p,d Deep veins
As,d Superficial veins
As,d Deep veins
Ap,d Perforator veins
Ap,d Deep veins
An No venous location identified
Pathophysiologic classification
Pr Reflux
Po Obstruction
Pr,o Reflux and obstruction
Pn No venous pathophysiology identifiable

* An additional 'a' can be added to each clinical class for asymptomatic patients and an 's' for symptoms.

Symptoms include: ache, pain, tightness, skin irritation, heaviness, muscle cramps, as well as other complaints attributable to venous dysfunction.

Modified from Eklöf B, Rutherford RB, Bergan JJ, Carpentier PH, Gloviczki P, Kistner RL, et al. Revision of the CEAP classification for chronic venous disorders: Consensus statement. J Vasc Surg 2004;40:1248-52.
Gloviczki P et al. The care of patients with varicose veins and associated chronic venous diseases: Clinical practice guidelines of the Society for Vascular Surgery and the American Venous Forum J Vasc Surg 2011;53:2S-48S
Joseph L. Mills, Sr, MD,a Michael S. Conte, MD,b David G. Armstrong, DPM, MD, PhD,a Frank B. Pomposelli, MD,c Andres Schanzer, MD,d Anton N. Sidawy, MD, MPH,e and George Andros, MD,f on behalf of the Society for Vascular Surgery Lower Extremity Guidelines Committee, Tucson, Ariz; San Francisco and Van Nuys, Calif; Brighton and Worcester, Mass; and Washington, D.C. The Society for Vascular Surgery Lower Extremity Threatened Limb Classification System: Risk stratification based on Wound, Ischemia, and foot Infection (WIfI). J Vasc Surg 2014;59:220-34.