ICD-10 Code I70.663 – Atherosclerosis of nonbiological bypass graft(s) of the extremities with gangrene, bilateral legs (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.663 – Atherosclerosis of nonbiological bypass graft(s) of the extremities with gangrene, bilateral legs
What it is
This code identifies atherosclerotic narrowing or blockage in a nonbiological bypass graft in the leg arteries, with gangrene affecting both legs. It indicates severe ischemic tissue death associated with graft disease.
Clinical signs
Findings may include painful, cold, or poorly perfused legs, diminished pulses, and tissue necrosis or blackened areas consistent with gangrene. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record documents atherosclerosis involving a nonbiological bypass graft in the extremities and gangrene in both legs. The provider should clearly link the graft disease to the ischemic tissue loss. Check documentation if laterality or graft type is unclear.
Do not use for
Do not use this code for native artery atherosclerosis without bypass graft involvement or for gangrene without documented atherosclerotic graft disease. Do not assign it when the graft type or bilateral leg involvement is not confirmed.
Coding tip
Confirm both the nonbiological graft and bilateral leg gangrene in the provider note before assigning I70.663.