ICD-10 Code I70.64 – Atherosclerosis of nonbiological bypass graft(s) of the left leg with ulceration (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.64 – Atherosclerosis of nonbiological bypass graft(s) of the left leg with ulceration
What it is
This code identifies atherosclerotic narrowing or blockage in a nonbiological bypass graft in the left leg, with an associated ulcer. Use it when the graft itself is the documented site of disease.
Clinical signs
Findings may include a chronic limb wound over the left leg, poor healing, and signs of reduced blood flow. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents atherosclerosis affecting a nonbiological bypass graft in the left leg and also documents ulceration. It fits cases where the ulcer is linked to the graft disease, not just to general peripheral vascular disease. Check documentation for laterality and graft type.
Do not use for
Do not use it for ulcers without documented graft atherosclerosis, or when the bypass graft is biological rather than nonbiological. Do not assume the left side if the record is unclear.
Coding tip
Verify both the graft material and the left-leg location in the note before assigning I70.64.