ICD-10 Code I70.542 – Atherosclerosis of nonautologous biological bypass graft(s) of the left leg with ulceration of calf (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.542 – Atherosclerosis of nonautologous biological bypass graft(s) of the left leg with ulceration of calf
What it is
This code identifies atherosclerotic narrowing or blockage in a nonautologous biological bypass graft in the left leg, with an ulcer located on the calf. Use it when the graft disease and ulcer are both documented.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include reduced limb perfusion, a chronic calf ulcer, and evidence that the bypass graft is affected by atherosclerosis.
When to use this code
Use I70.542 when the provider documents atherosclerosis in a nonautologous biological bypass graft of the left leg and specifies ulceration of the calf. The ulcer site must be the calf, and the laterality must be left. If the record does not clearly state both elements, check documentation.
Do not use for
Do not use this code for ulcers without documented atherosclerosis of the bypass graft. It is also incorrect for right leg graft disease, other ulcer sites, or grafts that are not nonautologous biological bypass grafts.
Coding tip
Confirm the graft type, laterality, and ulcer location in the operative or progress note before assigning the code.