ICD-10 Code I70.40 – Unspecified atherosclerosis of autologous vein bypass graft(s) of the extremities (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.40 – Unspecified atherosclerosis of autologous vein bypass graft(s) of the extremities
What it is
This code identifies atherosclerotic disease affecting an autologous vein bypass graft in an extremity when the documentation does not specify the graft location or laterality. It is used for graft narrowing or blockage due to plaque buildup.
Clinical signs
Clinical features vary; refer to documentation. Findings may include reduced graft patency, limb ischemic symptoms, diminished pulses, or evidence of graft stenosis or occlusion on imaging or vascular assessment.
When to use this code
Use this code when the provider documents atherosclerosis in an autologous vein bypass graft of an arm or leg, but does not identify the specific extremity or side. It also fits when the note simply states “atherosclerosis of autologous vein bypass graft” without further detail. Check documentation if the record later specifies the graft site.
Do not use for
Do not use this code for native artery atherosclerosis or for bypass graft disease that is not described as atherosclerotic. If the laterality or extremity is documented, choose the more specific code.
Coding tip
Query for the exact extremity and side whenever possible, because unspecified documentation limits code specificity.