Athscl native arteries of extremities w gangrene, left leg

This code signifies a severe form of peripheral artery disease (PAD) affecting the native arteries of the left leg, where the atherosclerotic plaque buildup has progressed to cause tissue death (gangrene). This indicates critical limb ischemia with irreversible tissue damage.

Apply this code when documentation clearly states atherosclerosis of the native arteries in the left leg and explicitly mentions the presence of gangrene in that limb. This is typically seen in patients with advanced PAD presenting with non-healing ulcers, black discoloration, and tissue necrosis.

• Always confirm the specific limb (left leg) and the presence of gangrene. Do not use if gangrene is absent or if the affected limb is not specified.
• Distinguish between atherosclerosis of native arteries versus bypass grafts; different codes apply to graft involvement.
• Sequence this code as a primary diagnosis when gangrene is the reason for the encounter, or as a secondary diagnosis when treating another condition but gangrene is a significant co-morbidity.