Athscl type of bypass of the right leg w ulceration of ankle

This code signifies the presence of atherosclerosis affecting a previously placed bypass graft in the right leg, specifically manifesting with an ulceration located on the ankle. It indicates a complication of peripheral artery disease where a revascularization procedure has failed due to progressive plaque buildup within the graft, leading to tissue breakdown.

Use this code when documentation confirms atherosclerotic changes within a non-autogenous or non-venous bypass graft (e.g., synthetic graft) in the right lower extremity, and a physician explicitly diagnoses an ankle ulceration as a direct consequence. This typically applies to patients with chronic limb ischemia who have undergone prior revascularization.

• Ensure the documentation specifies "other type" of bypass graft; if it's an autogenous vein graft, a different subcategory (I70.6-) would apply.
• Verify that the ulceration is explicitly linked to the atherosclerotic graft disease and located on the ankle.
• Always sequence this code after any underlying peripheral artery disease (e.g., I70.2-) if still present and being treated.