ICD-10 Code I70.391 – Other atherosclerosis of unspecified type of bypass graft(s) of the extremities, right leg (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.391 – Other atherosclerosis of unspecified type of bypass graft(s) of the extremities, right leg
What it is
This code identifies atherosclerotic narrowing or blockage in an unspecified bypass graft supplying the right leg. Use it when the graft type is not specified and the condition is limited to the right lower extremity.
Clinical signs
Clinical features vary; refer to documentation. Patients may have reduced limb perfusion, exertional leg pain, coolness, diminished pulses, or graft-related ischemic symptoms, but the record should support graft atherosclerosis in the right leg.
When to use this code
Use I70.391 when the provider documents atherosclerosis affecting an unspecified bypass graft in the right leg and no more specific graft type is stated. It may apply in follow-up visits, imaging results, or vascular assessments that confirm graft disease.
Choose this code only when the documentation clearly links the atherosclerosis to the bypass graft and the right leg. If the graft site, graft type, or laterality is unclear, check documentation before coding.
Do not use for
Do not use this code for native artery atherosclerosis, left leg disease, or bypass graft disease in another extremity. Check documentation if the problem is infection, thrombosis, or occlusion without atherosclerosis.
Coding tip
Verify both laterality and graft involvement in the note; if either is missing, query the provider before assigning I70.391.