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Patient is status of femoropopliteal bypass for his critical limb ischemia, resulting in the setting of a thrombosed popliteal artery aneurysm. He has had some increased claudication symptoms of difficult-to-heal wounds that appear to be primarily of venous nature in the right leg. So, the physician performed an angioplasty of the proximal vein graft stenosis. My question is, should I use the code for venous angioplasty of the fem-pop bypass graft for lower extremity? Or the arterial angioplasty code?