ICD-10 Code I70.403 – Unspecified atherosclerosis of autologous vein bypass graft(s) of the extremities, bilateral legs (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.403 – Unspecified atherosclerosis of autologous vein bypass graft(s) of the extremities, bilateral legs
What it is
This code identifies atherosclerotic narrowing or blockage affecting autologous vein bypass grafts in both legs, without further detail on the graft site or severity. Use it when the documentation confirms graft atherosclerosis but does not specify a more exact form.
Clinical signs
Clinical features vary; refer to documentation. Patients may have reduced leg circulation, exertional leg pain, diminished pulses, or graft-related ischemic findings, but the record must support graft atherosclerosis.
When to use this code
Use this code when the provider documents atherosclerosis in an autologous vein bypass graft in both lower extremities and does not identify a more specific code. It may apply after prior leg bypass surgery when graft disease is the active diagnosis. If the chart names a different graft type or laterality, check documentation.
Do not use for
Do not use this code for native artery atherosclerosis, graft infection, or acute graft occlusion without documented atherosclerosis. Check documentation if the record only says peripheral arterial disease.
Coding tip
Verify both the graft type and bilateral leg involvement before assigning I70.403.