ICD-10 Code I70.621 – Atherosclerosis of nonbiological bypass graft(s) of the extremities with rest pain, right leg (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.621 – Atherosclerosis of nonbiological bypass graft(s) of the extremities with rest pain, right leg
What it is
This code identifies atherosclerotic narrowing or blockage in a nonbiological bypass graft in the right leg, with pain present even at rest. Use it when the graft itself is the diseased vessel and the right lower extremity is specified.
Clinical signs
Typical documentation includes rest pain in the affected leg, often worse at night or when lying down. Clinical features vary; refer to documentation for evidence of graft-related peripheral arterial disease and right-sided involvement.
When to use this code
Use this code when the provider documents atherosclerosis affecting a nonbiological bypass graft in the right lower extremity and specifically notes rest pain. It also fits when the note clearly links ischemic pain at rest to that graft. If laterality or graft type is unclear, check documentation.
Do not use for
Do not use this code for native artery atherosclerosis, pain without documented rest pain, or disease in the left leg or unspecified side. Check documentation if the graft type is biological or not stated.
Coding tip
Verify both laterality and that the atherosclerosis is in the bypass graft, not the native vessel, before assigning I70.621.