Athscl type of bypass of the left leg w ulcer of unsp site

This code signifies the presence of atherosclerosis affecting a bypass graft in the left leg, specifically when the exact type of graft is not specified, and the condition has progressed to cause ulceration at an unidentifiable site. This indicates a chronic and severe form of peripheral artery disease impacting a previously revascularized limb.

Apply this code when documentation clearly indicates atherosclerosis within a bypass graft of the left lower extremity, accompanied by ulceration, but lacks specificity regarding the graft type or the precise location of the ulcer. This is typically seen in patients with failed or failing bypass grafts presenting with ischemic wounds.

• Ensure documentation specifies "left leg" and "ulceration" in the context of a bypass graft.
• If the type of bypass graft (e.g., femoropopliteal, femorotibial) or the ulcer site is known, a more specific code within the I70.74 series should be used.
• Code any associated infections of the ulcer separately.