Athscl nonaut bio bypass of the extrm w gangrene, bi legs

This code describes the hardening and narrowing of a non-native biological bypass graft in both legs, which has led to tissue death (gangrene). This condition indicates a severe complication of a previous revascularization procedure using a biological conduit not originating from the patient's own body.

Use this code when documentation clearly states atherosclerosis affecting a non-autologous biological bypass graft in both lower extremities, specifically complicated by gangrene. This typically occurs in patients with a history of peripheral artery disease who have undergone bypass surgery with a cadaveric or animal-derived graft.

• Ensure documentation specifies "nonautologous biological bypass graft" and "bilateral legs" to accurately assign this code.
• Confirm the presence of gangrene; without it, a different subcategory of I70.5 would be appropriate.
• Sequence this code as a primary diagnosis if it is the reason for the encounter, or as a secondary diagnosis if it is a co-morbidity impacting treatment.