Unsp athscl nonaut bio bypass of the extrm, oth extremity

This code describes the presence of hardening and narrowing of a non-native biological bypass graft located in an extremity, where the specific type of atherosclerosis is not documented. This graft was surgically implanted to bypass an obstructed blood vessel in a limb, and the current issue is an unspecified atherosclerotic process affecting this graft. The affected extremity is not specified as right or left.

Use this code when documentation indicates atherosclerosis affecting a biological bypass graft in an extremity, and the graft is explicitly stated as nonautologous (e.g., allograft, xenograft). This code is appropriate when the specific type of atherosclerosis (e.g., native vessel, in situ) is not detailed, and the affected extremity is not specified as right or left. Supporting documentation would include operative reports, imaging studies, or physician notes confirming the graft type and the presence of atherosclerosis.

• Ensure the documentation clearly specifies a nonautologous biological bypass graft; do not use for synthetic grafts or autologous grafts.
• Verify that the affected vessel is in an extremity and not a different anatomical location (e.g., coronary, renal).
• If the specific type of atherosclerosis (e.g., native vessel, in situ) or the laterality of the extremity is documented, a more specific code should be selected.