Athscl native arteries of left leg w ulceration of ankle

This code signifies a severe form of peripheral artery disease (PAD) affecting the native arteries of the left leg, specifically characterized by the presence of atherosclerosis. A critical component of this diagnosis is the development of an ulceration located on the ankle, indicating advanced tissue damage due to compromised blood flow.

Apply this code when documentation clearly states atherosclerosis of the native arteries in the left leg, accompanied by an ankle ulcer. This typically occurs in patients with chronic lower extremity ischemia. Supporting documentation should include physician notes detailing the location of the atherosclerosis, the presence and location of the ulcer, and laterality.

• Ensure the documentation specifies "native arteries" and not a bypass graft.
• Verify the ulcer's location is explicitly stated as the ankle; ulcers on other parts of the leg require different codes.
• Always sequence this code before any external cause codes if the ulcer resulted from an injury.