Oth athscl nonaut bio bypass of the extremities, left leg

This code signifies the presence of atherosclerosis affecting a non-native biological bypass graft located in the left leg. This graft, derived from a biological source other than the patient's own tissue (e.g., bovine, porcine), has developed plaque buildup and hardening, leading to narrowing or obstruction. This condition compromises blood flow to the left lower extremity.

Apply this code when documentation confirms atherosclerosis within a biological bypass graft in the left leg, where the graft material is not autologous. This typically occurs in patients who have undergone previous bypass surgery for peripheral artery disease using a xenograft or allograft. Supporting documentation should specify the graft type (nonautologous biological), its location (left leg), and the presence of atherosclerotic changes.

• Ensure the documentation clearly specifies "nonautologous biological" graft material to differentiate from autologous grafts (I70.4- series) or prosthetic grafts (I70.6- series).
• Verify the laterality is explicitly stated as "left leg"; use I70.591 for the right leg or I70.593 for bilateral involvement.
• Do not confuse this with complications of mechanical prosthetic bypass grafts (I70.6- series) or native artery atherosclerosis (I70.2- series).