Athscl unsp type bypass of the extrm w gangrene, unsp extrm

This code signifies a severe form of peripheral artery disease where atherosclerosis has developed within an unspecified type of bypass graft in an extremity, leading to tissue necrosis (gangrene). It indicates a critical limb ischemia scenario affecting a previously revascularized limb, without specifying the graft material or the affected extremity.

Apply this code when documentation confirms atherosclerosis within a bypass graft in an extremity, complicated by gangrene, but the specific type of graft (e.g., autogenous vein, synthetic) and the affected extremity (left/right, upper/lower) are not specified. This code is appropriate when the physician explicitly diagnoses "atherosclerosis of extremity bypass graft with gangrene" without further detail.

• Ensure documentation clearly states the presence of gangrene secondary to atherosclerosis within a bypass graft.
• Avoid this code if the specific extremity (e.g., right lower limb) or the type of bypass graft is documented; instead, use a more specific I70.36- subcategory.
• Sequence this code as a primary diagnosis when it is the reason for the encounter, or as a secondary diagnosis if another condition is the primary reason for admission/visit.