Athscl autologous vein bypass of extremity w ulceration

This code signifies the presence of atherosclerosis affecting a vein graft that was surgically implanted from the patient's own body (autologous) to bypass an occluded artery in an extremity other than the lower limbs, and where an ulcer has developed as a complication. This condition indicates progressive hardening and narrowing within the bypass graft itself, leading to compromised blood flow and tissue breakdown.

Use this code when documentation clearly states atherosclerosis within an autologous vein bypass graft in an upper extremity, head, neck, or trunk, and explicitly mentions the presence of an associated ulcer. This typically occurs in patients with a history of peripheral artery disease who have undergone bypass surgery and subsequently developed graft failure with skin breakdown.

• Ensure the documentation specifies "autologous vein bypass graft" and not a synthetic or other type of graft.
• Verify the affected extremity is not a lower extremity; if it is, a different code from the I70.2- or I70.3- series would be appropriate.
• Always look for explicit mention of "ulceration" as a complication of the graft atherosclerosis.