ICD-10 Code I70.309 – Unspecified atherosclerosis of unspecified type of bypass graft(s) of the extremities, unspecified extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.309 – Unspecified atherosclerosis of unspecified type of bypass graft(s) of the extremities, unspecified extremity
What it is
This code identifies atherosclerotic narrowing or blockage in a bypass graft in an arm or leg when the graft type and exact extremity are not documented. Use it when the record confirms graft disease but does not specify more detail.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include reduced graft patency, diminished distal pulses, limb ischemic symptoms, or imaging evidence of graft atherosclerosis.
When to use this code
Use this code when the provider documents atherosclerosis involving a bypass graft of an extremity, but the chart does not identify whether the graft is autologous or synthetic. It also fits when the affected extremity is not specified. If the note names a more specific graft type or limb, code that instead.
Do not use for
Do not use this code for native vessel peripheral arterial disease without a bypass graft. Do not use it if documentation supports graft occlusion, infection, or another complication instead of atherosclerosis.
Coding tip
Review operative reports and vascular notes for graft type and laterality before assigning this unspecified code.