Athscl nonbiol bypass of the extrm w gangrene, bi legs

This code signifies the presence of atherosclerosis affecting non-biological (synthetic) bypass grafts in both lower extremities, complicated by gangrene. It indicates a severe form of peripheral artery disease where the grafted vessels, intended to restore blood flow, have developed plaque buildup, leading to tissue necrosis in both legs.

Apply this code when documentation explicitly states atherosclerosis of synthetic bypass grafts in both legs, accompanied by gangrenous changes. This typically occurs in patients with a history of peripheral bypass surgery using prosthetic grafts who subsequently develop severe graft failure and tissue death.

• Ensure documentation specifies "nonbiological" or "synthetic" bypass grafts; do not use for autologous vein grafts.
• Confirm gangrene is present and affects both lower extremities.
• Sequence this code after any underlying systemic conditions contributing to the atherosclerosis, if applicable.