ICD-10 Code I70.539 – Atherosclerosis of nonautologous biological bypass graft(s) of the right leg with ulceration of unspecified site (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.539 – Atherosclerosis of nonautologous biological bypass graft(s) of the right leg with ulceration of unspecified site
What it is
This code identifies atherosclerosis affecting a nonautologous biological bypass graft in the right leg, with an ulcer present but the site not specified. Use it when the graft is narrowed or blocked by plaque and the ulcer is documented.
Clinical signs
Common findings include reduced limb perfusion, graft-related ischemic changes, and an ulcer on the right leg. Clinical features vary; refer to documentation for graft type, laterality, and ulcer location.
When to use this code
Use I70.539 when the record states atherosclerosis of a biological bypass graft in the right leg and also documents an ulcer, but does not specify the ulcer site. You should code the condition only when the graft involvement and ulcer are clearly linked in the note. If the ulcer site is documented elsewhere, check documentation before assigning this code.
Do not use for
Do not use this code for native artery atherosclerosis, ulcers without graft disease, or bypass grafts in other locations. Check documentation if the graft is synthetic or if the ulcer site is specified differently.
Coding tip
Verify the graft is nonautologous biological and that the right leg and ulceration are both documented before coding.