ICD-10 Code I70.59 – Other atherosclerosis of nonautologous biological bypass graft(s) of the extremities (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.59 – Other atherosclerosis of nonautologous biological bypass graft(s) of the extremities
What it is
This code identifies atherosclerotic narrowing or blockage affecting a nonautologous biological bypass graft in an arm or leg. Use it when the graft itself, not the native vessel, is documented as having atherosclerosis.
Clinical signs
Clinical features vary; refer to documentation. Findings may include reduced graft patency, diminished distal pulses, limb ischemic symptoms, or imaging evidence of plaque within the graft.
When to use this code
Use I70.59 when the record clearly states atherosclerosis involving a nonautologous biological bypass graft in an extremity. It may apply after prior bypass surgery when the graft shows atherosclerotic disease. Check documentation for the graft type and limb involved.
Do not use for
Do not use this code for atherosclerosis of native arteries or for graft problems that are due only to thrombosis, infection, or mechanical failure. Check documentation if the graft material is not clearly a nonautologous biological graft.
Coding tip
Confirm both the graft type and the extremity site in the operative or vascular note before assigning I70.59.