ICD-10 Code I70.4 – Atherosclerosis of autologous vein bypass graft(s) of the extremities (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.4 – Atherosclerosis of autologous vein bypass graft(s) of the extremities
What it is
This code identifies atherosclerotic narrowing or blockage in an autologous vein bypass graft supplying an extremity. Use it when the graft itself, not the native artery, is documented as affected.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include reduced graft patency, diminished distal perfusion, claudication, or ischemic symptoms in the affected limb.
When to use this code
Use this code when the provider documents atherosclerosis involving an autologous vein bypass graft in an arm or leg. It may appear in follow-up visits, vascular studies, or operative assessments that specifically describe graft disease.
Code it only when the record clearly identifies the bypass conduit as autologous vein and the extremity location is stated. Check documentation if the note mentions bypass graft disease without specifying the graft type or limb.
Do not use for
Do not use this code for atherosclerosis of native arteries, prosthetic bypass grafts, or coronary bypass graft disease. Check documentation if the vessel type or anatomic site is unclear.
Coding tip
Verify both the graft material and extremity location before assigning I70.4.