Athscl unsp type bypass of the extrm w gangrene, oth extrm

This code signifies atherosclerosis affecting a bypass graft in an extremity, specifically when the graft type is not specified, and the patient has developed gangrene in an other extremity (not necessarily the one with the graft). It indicates a severe complication of peripheral artery disease (PAD) with graft failure and tissue necrosis.

Use this code when documentation confirms atherosclerosis within an unspecified type of bypass graft in an extremity, and gangrene is present in a different, "other" extremity. This typically occurs in patients with advanced PAD who have undergone bypass surgery and subsequently developed critical limb ischemia with tissue loss. Documentation must clearly state the presence of gangrene and the atherosclerotic involvement of the bypass graft.

• Ensure the documentation specifies "unspecified type" of bypass graft. If the graft type (e.g., autologous vein, synthetic) is known, a more specific code within the I70.3 series should be used.
• Verify that gangrene is present in an "other" extremity. If the gangrene is in the same extremity as the bypass graft, a different code would be appropriate.
• Always sequence this code after the underlying atherosclerosis (e.g., I70.2- for native artery atherosclerosis) if it is also being treated.