ICD-10 Code I70.649 – Atherosclerosis of nonbiological bypass graft(s) of the left leg with ulceration of unspecified site (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.649 – Atherosclerosis of nonbiological bypass graft(s) of the left leg with ulceration of unspecified site
What it is
This code identifies atherosclerotic narrowing or blockage affecting a nonbiological bypass graft in the left leg, with an associated ulcer at an unspecified site. Use it when the provider documents both graft disease and ulceration.
Clinical signs
Findings may include reduced limb perfusion, graft-related ischemic symptoms, and a nonhealing ulcer in the affected leg. Clinical features vary; refer to documentation for the ulcer location and whether the graft is nonbiological.
When to use this code
Use I70.649 when the record clearly states atherosclerosis of a nonbiological bypass graft in the left leg and also documents ulceration, but the ulcer site is not specified. You should confirm the left-sided graft involvement and that the ulcer is linked to the vascular disease. If the documentation names a different site or a different graft type, code accordingly.
Do not use for
Do not use this code for native-vessel peripheral arterial disease without bypass graft involvement. Do not use it if the ulcer is absent or if the graft type, laterality, or ulcer site is not supported by documentation.
Coding tip
Verify both the graft type and the ulcer linkage in the provider note before assigning I70.649.