Athscl nonaut bio bypass of right leg w ulcer of unsp site

This code signifies the presence of atherosclerosis affecting a biological bypass graft in the right leg, where the graft material is not from the patient's own body (e.g., bovine, porcine). A key feature is the development of an ulceration, indicating tissue breakdown, at an unspecified location on the right leg associated with this compromised graft.

Assign this code when documentation explicitly states atherosclerosis of a nonautologous biological bypass graft in the right leg, accompanied by an ulcer. This typically occurs in patients with peripheral artery disease who have undergone bypass surgery using a xenograft or allograft, and subsequently developed graft failure manifesting as atherosclerotic changes and tissue ulceration.

• Ensure the documentation specifies "nonautologous biological" graft; otherwise, consider codes for autologous grafts or unspecified graft types.
• Always look for laterality (right leg) and the presence of ulceration as these are key components of this specific code.
• Do not use this code for mechanical grafts or if the ulceration is unrelated to the graft's atherosclerotic process.