ICD-10 Code I70.641 – Atherosclerosis of nonbiological bypass graft(s) of the left leg with ulceration of thigh (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.641 – Atherosclerosis of nonbiological bypass graft(s) of the left leg with ulceration of thigh
What it is
This code identifies atherosclerosis affecting a nonbiological bypass graft in the left leg, with an associated ulcer on the thigh. Use it when documentation links the graft disease and the ulceration to the same left-leg site.
Clinical signs
Findings may include reduced limb perfusion, graft stenosis or occlusion, and a nonhealing ulcer on the left thigh. Clinical features vary; refer to documentation for the exact graft type, laterality, and ulcer location.
When to use this code
Use I70.641 when the record states atherosclerosis in a nonbiological bypass graft of the left leg and specifically notes ulceration of the thigh. The provider should document the ulcer site and the relationship to the graft disease. If the ulcer is elsewhere, or the graft type is not stated, check documentation before coding.
Do not use for
Do not use this code for native-artery atherosclerosis without a bypass graft, or for ulcers not linked to the graft condition. Do not assign it if the laterality or ulcer location is different.
Coding tip
Verify the graft is nonbiological and that the ulcer is documented on the left thigh before selecting this code.