ICD-10 Code I70.563 – Atherosclerosis of nonautologous biological bypass graft(s) of the extremities with gangrene, bilateral legs (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.563 – Atherosclerosis of nonautologous biological bypass graft(s) of the extremities with gangrene, bilateral legs
What it is
This code identifies atherosclerotic narrowing or blockage affecting a nonautologous biological bypass graft in both legs, with gangrene present. Use it when the graft itself is documented as the site of disease, not the native artery.
Clinical signs
Findings may include ischemic tissue loss, black or dead tissue, and poor perfusion in one or both legs. Clinical features vary; refer to documentation for the graft location and confirmation of gangrene.
When to use this code
Use this code when the provider documents atherosclerosis in a biological bypass graft of the extremities and gangrene affects both legs. It applies when the record clearly links the gangrene to bilateral lower-extremity involvement. Check documentation if the graft type or laterality is unclear.
Do not use for
Do not use it for atherosclerosis of native arteries, other bypass graft types, or disease without gangrene. If the chart does not specify a nonautologous biological graft, check documentation.
Coding tip
Verify three elements together: graft type, extremity involvement, and bilateral gangrene.