ICD-10 Code I65.03 – Occlusion and stenosis of bilateral vertebral arteries (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I65.03 – Occlusion and stenosis of bilateral vertebral arteries
What it is
I65.03 identifies narrowing or blockage in both vertebral arteries, the vessels that supply blood to the back of the brain. Use it when documentation clearly states bilateral vertebral artery occlusion or stenosis.
Clinical signs
Clinical features vary; refer to documentation. Patients may have symptoms of reduced posterior circulation blood flow, but the code is based on the documented vascular finding, not on symptoms alone.
When to use this code
Use this code when the provider documents bilateral vertebral artery stenosis or occlusion on imaging, vascular studies, or in the assessment. It also applies when the note clearly states both vertebral arteries are affected. If laterality is unclear, check documentation.
Do not use for
Do not use this code for unilateral vertebral artery disease or for nonspecific cerebrovascular symptoms without a confirmed vascular diagnosis. If the record does not specify bilateral involvement, check documentation.
Coding tip
Verify that “bilateral” is stated explicitly in the report or assessment before assigning I65.03.