ICD-10 Code I70.644 – Atherosclerosis of nonbiological bypass graft(s) of the left leg with ulceration of heel and midfoot (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.644 – Atherosclerosis of nonbiological bypass graft(s) of the left leg with ulceration of heel and midfoot
What it is
This code identifies atherosclerotic narrowing in a nonbiological bypass graft supplying the left leg, with an associated ulcer on the heel or midfoot. Use it when documentation links the graft disease and the ulcer location.
Clinical signs
Clinical features vary; refer to documentation. Typical findings include a documented left leg bypass graft with peripheral arterial disease and a heel or midfoot ulcer consistent with ischemic tissue loss.
When to use this code
Use this code when the provider documents atherosclerosis affecting a nonbiological bypass graft in the left leg and specifies an ulcer of the heel or midfoot. It is appropriate when the ulcer is part of the coded vascular disease description. Check documentation if the graft type, laterality, or ulcer site is unclear.
Do not use for
Do not use this code for native-vessel atherosclerosis without a bypass graft, or for ulcers in other locations. If the record does not confirm a nonbiological graft and left-sided involvement, check documentation.
Coding tip
Match the graft type, laterality, and ulcer location exactly to the provider’s wording before assigning I70.644.