ICD-10 Code I70.343 – Atherosclerosis of unspecified type of bypass graft(s) of the left leg with ulceration of ankle (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.343 – Atherosclerosis of unspecified type of bypass graft(s) of the left leg with ulceration of ankle
What it is
This code identifies atherosclerotic disease in an unspecified bypass graft in the left leg, with an associated ulcer at the ankle. Use it when the record links the graft disease and the ulceration.
Clinical signs
Findings may include impaired blood flow in the grafted limb, poor wound healing, and a documented ankle ulcer. Clinical features vary; refer to documentation for laterality, graft type, and ulcer linkage.
When to use this code
Use this code when the provider documents atherosclerosis affecting a bypass graft in the left leg and specifies ankle ulceration. It fits cases where the ulcer is part of the documented vascular complication, not a separate unrelated wound.
Code it only when the record supports both the graft location and the ulcer site. Check documentation if the graft type is not stated or if the ulcer is not clearly tied to the atherosclerotic disease.
Do not use for
Do not use this code for native vessel atherosclerosis, ulcers without documented graft involvement, or ulcers at a different site. Check documentation if the left leg or ankle location is unclear.
Coding tip
Confirm that the ulcer is documented as being due to the graft-related atherosclerosis before assigning I70.343.