ICD-10 Code I70.645 – Atherosclerosis of nonbiological bypass graft(s) of the left leg with ulceration of other part of foot (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.645 – Atherosclerosis of nonbiological bypass graft(s) of the left leg with ulceration of other part of foot
What it is
This code identifies atherosclerotic narrowing or blockage in a nonbiological bypass graft in the left leg, with an associated ulcer on another part of the foot. Use it when the documentation links both the graft disease and the ulcer.
Clinical signs
Typical findings include reduced limb perfusion, diminished pulses, or ischemic pain, along with a documented foot ulcer. Clinical features vary; refer to documentation for the graft location and ulcer site.
When to use this code
Use I70.645 when the provider documents atherosclerosis affecting a nonbiological bypass graft in the left leg and specifies ulceration of another part of the foot. The record should support laterality, graft type, and ulcer association. If the ulcer site or graft details are unclear, check documentation.
Do not use for
Do not use this code for native artery disease without a bypass graft, or for ulcers not linked to the graft-related atherosclerosis. Do not assign it if the left-leg or ulcer location is not documented.
Coding tip
Verify that the bypass graft is nonbiological and that the ulcer is documented as part of the same condition before coding.