Athscl autol vein bypass of the extrm w gangrene, unsp extrm

This code signifies the presence of atherosclerosis specifically affecting an autologous vein bypass graft in an extremity, complicated by gangrene. This condition indicates severe peripheral arterial disease where a patient's own vein, surgically implanted to bypass an occluded artery, has now developed plaque buildup and subsequent tissue necrosis.

Apply this code when documentation clearly states atherosclerosis of an autologous vein bypass graft in an extremity, along with the presence of gangrene. This is typically seen in patients with advanced peripheral artery disease and failed bypass grafts. The medical record must explicitly link the gangrene to the compromised bypass graft.

• Ensure the documentation specifies an autologous vein graft; do not use for synthetic or allograft bypasses.
• Verify that gangrene is explicitly documented as a complication of the graft atherosclerosis, not from another cause.
• This code requires an additional code to specify the laterality of the affected extremity (e.g., right, left, bilateral).