Athscl type of bypass of the extrm w gangrene, right leg

This code signifies the presence of atherosclerosis affecting a bypass graft in the right leg, specifically when gangrene has developed as a complication. It indicates a failure or significant narrowing of the graft due to plaque buildup, leading to severe tissue necrosis in the right lower extremity. This condition represents a critical stage of peripheral artery disease (PAD) in a patient with prior revascularization.

Use this code when documentation clearly states atherosclerosis of a bypass graft (e.g., femoropopliteal, femorodistal) in the right leg, accompanied by a diagnosis of gangrene in the same limb. This typically applies to patients presenting with non-healing wounds, severe pain, or signs of tissue death distal to the compromised graft. Supporting documentation should include operative reports detailing the bypass graft, imaging studies confirming graft atherosclerosis, and clinical notes describing the gangrenous changes.

• Ensure the documentation specifies "other type of bypass graft" to differentiate from autologous vein or nonautologous biological bypass grafts.
• Always sequence this code first if it represents the primary reason for the encounter, followed by codes for the specific type of gangrene (e.g., dry, wet) if further specified.
• Verify laterality; this code is specific to the right leg. Do not use for left leg or bilateral involvement.