ICD-10 Code I70.491 – Other atherosclerosis of autologous vein bypass graft(s) of the extremities, right leg (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.491 – Other atherosclerosis of autologous vein bypass graft(s) of the extremities, right leg
What it is
This code identifies atherosclerotic narrowing or blockage in an autologous vein bypass graft in the right leg. It applies when the graft itself, not the native artery, is the documented site of disease.
Clinical signs
Clinical features vary; refer to documentation. Findings may include reduced leg perfusion, claudication, diminished pulses, or graft-related ischemic symptoms when the bypass graft is affected.
When to use this code
Use this code when the provider documents atherosclerosis involving an autologous vein bypass graft in the right lower extremity. It is appropriate when the record specifies the right leg and does not identify a more specific bypass-graft complication.
Code it from operative, vascular, or follow-up notes that clearly describe graft atherosclerosis. Check documentation if the laterality, graft type, or anatomic site is unclear.
Do not use for
Do not use this code for atherosclerosis of native arteries, other bypass graft types, or disease in the left leg. If the record describes occlusion, thrombosis, or another complication instead, use the documented condition.
Coding tip
Verify that the bypass graft is autologous vein and that the right leg is documented before assigning I70.491.