ICD-10 Code I70.421 – Atherosclerosis of autologous vein bypass graft(s) of the extremities with rest pain, right leg (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.421 – Atherosclerosis of autologous vein bypass graft(s) of the extremities with rest pain, right leg
What it is
This code identifies atherosclerotic narrowing in an autologous vein bypass graft in the right leg, with rest pain caused by reduced blood flow. It applies when the graft itself is the diseased vessel.
Clinical signs
Typical findings include ischemic pain in the right leg that occurs at rest, often worse at night or when the leg is elevated. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record clearly documents atherosclerosis affecting an autologous vein bypass graft in the right lower extremity and the patient has rest pain. You should also confirm that the bypass graft is the source of the arterial disease, not the native artery.
Do not use for
Do not use this code for pain without documented atherosclerosis or when the affected vessel is a prosthetic graft or native artery instead. Check documentation.
Coding tip
Verify both laterality and graft type in the operative or vascular note before assigning I70.421.