Oth athscl nonaut bio bypass of the extrm, bilateral legs

This code signifies the hardening and narrowing of arteries within non-native biological bypass grafts located in both lower limbs. These grafts, derived from sources other than the patient's own body, are experiencing atherosclerotic changes, impairing blood flow to the extremities.

Apply this code when documentation explicitly states atherosclerosis affecting a nonautologous biological bypass graft in both legs. This typically occurs in patients who have undergone bypass surgery using donor tissue or synthetic materials and are now presenting with graft failure due to plaque buildup.

• Differentiate from autologous grafts (I70.51-I70.56) and native vessel atherosclerosis.
• Ensure documentation specifies "nonautologous biological bypass graft" and "bilateral legs."
• Code also any associated complications, such as claudication or ulceration, if present.