ICD-10 Code I70.521 – Atherosclerosis of nonautologous biological bypass graft(s) of the extremities with rest pain, right leg (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.521 – Atherosclerosis of nonautologous biological bypass graft(s) of the extremities with rest pain, right leg
What it is
This code identifies plaque buildup in a nonautologous biological bypass graft in the right leg, causing rest pain. It describes graft-related peripheral arterial disease, not native artery disease.
Clinical signs
Typical findings include ischemic rest pain in the right lower extremity, often worse at night or when the leg is elevated. Clinical features vary; refer to documentation.
When to use this code
Use I70.521 when the provider documents atherosclerosis affecting a nonautologous biological bypass graft in the right leg and specifies rest pain. The record should link the pain to the graft disease, not to another vascular cause. Check documentation if laterality or graft type is unclear.
Do not use for
Do not use this code for atherosclerosis of native arteries, other extremity locations, or graft disease without rest pain. Do not assign it when the chart does not confirm a nonautologous biological bypass graft.
Coding tip
Verify three elements in the note: biological graft, right leg laterality, and rest pain; all must be documented to support I70.521.