ICD-10 Code I70.409 – Unspecified atherosclerosis of autologous vein bypass graft(s) of the extremities, unspecified extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.409 – Unspecified atherosclerosis of autologous vein bypass graft(s) of the extremities, unspecified extremity
What it is
This code identifies atherosclerotic narrowing or blockage in an autologous vein bypass graft in an extremity when the affected limb is not specified. Use it when documentation confirms graft atherosclerosis but does not name the side.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include reduced graft patency, decreased distal perfusion, claudication, or ischemic symptoms in the bypassed limb.
When to use this code
Use I70.409 when the provider documents atherosclerosis involving an autologous vein bypass graft in an arm or leg, but the record does not specify the extremity. It also fits when the condition is described without laterality or more detailed site information. If the note identifies the limb, use the more specific code instead.
Do not use for
Do not use this code for native artery atherosclerosis, prosthetic graft disease, or graft occlusion without documented atherosclerosis. Check documentation if the record only states peripheral vascular disease or bypass graft complications.
Coding tip
Capture laterality and graft type first; if either is missing, code only what the documentation clearly supports.