ICD-10 Code I70.543 – Atherosclerosis of nonautologous biological bypass graft(s) of the left leg with ulceration of ankle (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.543 – Atherosclerosis of nonautologous biological bypass graft(s) of the left leg with ulceration of ankle
What it is
This code identifies atherosclerotic narrowing in a nonautologous biological bypass graft in the left leg, with an associated ankle ulcer. It tells you the graft is affected by plaque buildup and the ulcer is part of the documented condition.
Clinical signs
Typical findings include evidence of peripheral arterial disease in the graft and a documented ulcer at the ankle. Clinical features vary; refer to documentation for laterality, graft type, and ulcer details.
When to use this code
Use this code when the provider documents atherosclerosis in a nonautologous biological bypass graft of the left leg and specifically links it to an ankle ulcer. It is appropriate when the ulcer site and graft location are both confirmed in the record.
Check documentation if the ulcer location is different, if the graft type is not biological, or if the disease is described only as native vessel atherosclerosis. You should also verify that the left leg is explicitly identified.
Do not use for
Do not use this code for ulcers without documented atherosclerosis of the bypass graft. Do not assign it when the graft is autologous, the laterality is not left, or the ulcer is not at the ankle.
Coding tip
Match the graft type, laterality, and ulcer location exactly as documented before assigning I70.543.