ICD-10 Code I70.639 – Atherosclerosis of nonbiological bypass graft(s) of the right leg with ulceration of unspecified site (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.639 – Atherosclerosis of nonbiological bypass graft(s) of the right leg with ulceration of unspecified site
What it is
This code identifies atherosclerotic narrowing or blockage in a nonbiological bypass graft in the right leg, with an associated ulcer. It applies when the ulcer site is not further specified in the documentation.
Clinical signs
Findings may include reduced limb perfusion, pain, or tissue loss in the right leg. Clinical features vary; refer to documentation for the graft location and the presence of an ulcer.
When to use this code
Use this code when the provider documents atherosclerosis affecting a nonbiological bypass graft in the right lower extremity and an ulcer is present. The ulcer site must be unspecified in the record. Check documentation if the graft type, laterality, or ulcer details are unclear.
Do not use for
Do not use this code for native artery atherosclerosis without a bypass graft, or when the graft is biological rather than nonbiological. If the ulcer site is specified differently, select the more precise code.
Coding tip
Verify laterality, graft type, and ulcer specificity before assigning I70.639.