ICD-10 Code I70.499 – Other atherosclerosis of autologous vein bypass graft(s) of the extremities, unspecified extremity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.499 – Other atherosclerosis of autologous vein bypass graft(s) of the extremities, unspecified extremity
What it is
This code identifies atherosclerotic narrowing or plaque buildup in an autologous vein bypass graft in an extremity when the affected limb is not specified. It documents graft disease rather than native artery disease.
Clinical signs
Clinical features vary; refer to documentation. Patients may have reduced graft patency, diminished distal perfusion, or recurrent ischemic symptoms in the bypassed limb.
When to use this code
Use this code when the record states atherosclerosis affecting an autologous vein bypass graft in an extremity and does not identify the right or left side. It fits postoperative vascular follow-up, imaging findings, or operative notes describing graft atherosclerosis. If the limb is documented, select the more specific code.
Do not use for
Do not use it for atherosclerosis of native arteries, prosthetic graft disease, or bypass graft occlusion without documented atherosclerosis. Check documentation if the note only says stenosis, thrombosis, or graft failure.
Coding tip
Code the graft type and laterality exactly as documented; unspecified extremity is appropriate only when the record truly lacks side detail.