Athscl nonbiol bypass of the extrm w gangrene, oth extremity

This code signifies the presence of atherosclerosis affecting a synthetic or artificial bypass graft located in an extremity other than the lower limbs (e.g., upper extremity). A critical component of this diagnosis is the development of gangrene in the affected extremity, indicating severe tissue necrosis due to compromised blood flow through the diseased graft.

Use this code when documentation confirms atherosclerosis within a non-autologous bypass graft in an upper extremity or other non-lower extremity site, accompanied by gangrenous changes. This typically occurs in patients with pre-existing peripheral artery disease who have undergone bypass surgery using prosthetic materials. Supporting documentation should clearly specify the type of graft, the affected extremity, and the presence of gangrene.

• Ensure the documentation explicitly states "nonbiological" or "synthetic" graft material and specifies an "other extremity" (e.g., upper limb).
• Always code the underlying peripheral artery disease (e.g., I70.2- series) as a primary or co-existing condition.
• Verify the presence of gangrene; without it, a different code from the I70.6- series would be more appropriate.