ICD-10 Code I66.2 – Occlusion and stenosis of posterior cerebral artery (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I66.2 – Occlusion and stenosis of posterior cerebral artery
What it is
I66.2 identifies narrowing or blockage of the posterior cerebral artery, one of the brain’s major arteries. Use it when documentation specifies this vessel and the condition is nontraumatic.
Clinical signs
Clinical features vary; refer to documentation. Findings may include neurologic deficits related to posterior circulation ischemia, such as visual field disturbance or other focal brain symptoms, when linked to posterior cerebral artery disease.
When to use this code
Use I66.2 when the provider documents occlusion or stenosis of the posterior cerebral artery, including imaging-confirmed disease. It is appropriate for nontraumatic arterial narrowing or blockage affecting that specific intracranial vessel. Check documentation if the record only says cerebral artery disease without naming the artery.
Do not use for
Do not use this code for traumatic vessel injury, embolic stroke without documented arterial stenosis or occlusion, or disease of a different cerebral artery. If the artery is not specified, check documentation.
Coding tip
Code the named artery exactly as documented; laterality is not used here, so verify the posterior cerebral artery is explicitly stated.