ICD-10 Code I70.603 – Unspecified atherosclerosis of nonbiological bypass graft(s) of the extremities, bilateral legs (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.603 – Unspecified atherosclerosis of nonbiological bypass graft(s) of the extremities, bilateral legs
What it is
This code identifies atherosclerotic narrowing or blockage in a nonbiological bypass graft in both legs when the record does not specify the graft site more precisely. Use it for graft disease affecting the extremities, not native arteries.
Clinical signs
Clinical features may include reduced graft patency, diminished pulses, claudication, rest pain, or ischemic changes in the legs. Clinical features vary; refer to documentation.
When to use this code
Use I70.603 when the provider documents atherosclerosis involving a nonbiological bypass graft in both lower extremities and does not name a more specific vessel or laterality code. It also fits when the note states bilateral leg involvement without further detail. Check documentation if the record only mentions peripheral arterial disease or graft occlusion without atherosclerosis.
Do not use for
Do not use this code for atherosclerosis of native leg arteries, a biologic graft, or a graft in a single limb when laterality is specified differently. Do not use it if the documentation does not support atherosclerotic disease.
Coding tip
Confirm that the graft is nonbiological and that both legs are involved before assigning I70.603.