ICD-10 Code I70.463 – Atherosclerosis of autologous vein bypass graft(s) of the extremities with gangrene, bilateral legs (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.463 – Atherosclerosis of autologous vein bypass graft(s) of the extremities with gangrene, bilateral legs
What it is
This code identifies atherosclerotic narrowing or blockage in an autologous vein bypass graft in both legs, with gangrene present. It tells you the graft, the limb location, and the severity.
Clinical signs
Typical findings include poor limb perfusion, ischemic pain, tissue loss, and gangrene in both legs. Clinical features vary; refer to documentation for graft type, laterality, and evidence of gangrene.
When to use this code
Use I70.463 when the provider documents atherosclerosis affecting an autologous vein bypass graft in both lower extremities and gangrene is present. The record should support the bypass graft origin and bilateral leg involvement. If the graft type or laterality is unclear, check documentation.
Do not use for
Do not use this code for native artery atherosclerosis, prosthetic bypass graft disease, or graft problems without gangrene. Check documentation if the condition is limited to one leg or if gangrene is not confirmed.
Coding tip
Verify that the bypass graft is autologous vein and that gangrene is documented before assigning this code.