Athscl autol vein bypass of the extrm w gangrene, bi legs

This code signifies the presence of atherosclerosis affecting a vein graft that was surgically implanted from the patient's own body (autologous) to bypass an occluded artery in both lower extremities. This condition is further complicated by the development of gangrene in the affected legs, indicating severe tissue death due to critical limb ischemia.

Use this code when documentation clearly indicates atherosclerotic changes within an autologous vein bypass graft in both legs, accompanied by gangrene. This typically occurs in patients with a history of peripheral artery disease and prior bypass surgery who are now experiencing severe graft failure and tissue necrosis. Supporting documentation would include operative reports detailing the bypass, vascular studies confirming graft atherosclerosis, and clinical notes describing gangrene.

• Ensure documentation specifies "autologous vein bypass graft" and not another type of graft (e.g., synthetic).
• Verify that gangrene is explicitly documented as present in both legs.
• Sequence this code after any codes for the underlying peripheral artery disease or other related conditions, if applicable, unless the gangrene is the primary reason for the encounter.