ICD-10 Code I70.591 – Other atherosclerosis of nonautologous biological bypass graft(s) of the extremities, right leg (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.591 – Other atherosclerosis of nonautologous biological bypass graft(s) of the extremities, right leg
What it is
This code identifies atherosclerotic narrowing or blockage in a nonautologous biological bypass graft in the right leg. Use it when the graft itself, not the native artery, is affected by plaque-related disease.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include reduced graft patency, diminished distal pulses, claudication, ischemic pain, or signs of limb ischemia documented as involving the right leg graft.
When to use this code
Use this code when the provider documents atherosclerosis of a biological bypass graft in the right lower extremity and specifies that it is nonautologous. It applies when the graft is the diseased vessel segment, not simply the underlying peripheral artery disease. If the record does not clearly identify the graft type or laterality, check documentation.
Do not use for
Do not use this code for atherosclerosis of native arteries, autologous vein grafts, or graft disease without documented atherosclerosis. If the right leg site or nonautologous graft status is not confirmed, check documentation.
Coding tip
Verify three elements in the note: atherosclerosis, nonautologous biological bypass graft, and right leg laterality.