ICD-10 Code I66.29 – Occlusion and stenosis of unspecified posterior cerebral artery (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I66.29 – Occlusion and stenosis of unspecified posterior cerebral artery
What it is
This code identifies narrowing or blockage of a posterior cerebral artery when the side is not specified. Use it for a cerebrovascular arterial lesion affecting posterior brain circulation.
Clinical signs
Clinical features vary; refer to documentation. Findings may include stroke or transient ischemic symptoms involving visual, sensory, or cognitive changes consistent with posterior cerebral artery territory involvement.
When to use this code
Use I66.29 when the provider documents occlusion or stenosis of a posterior cerebral artery and does not specify right or left. It may appear in inpatient, emergency, or follow-up records tied to imaging or neurologic assessment. Code only when the diagnosis is clearly documented.
Do not use for
Do not use this code for embolism, hemorrhage, or generalized cerebrovascular disease without documented posterior cerebral artery stenosis or occlusion. Check documentation if the artery side is specified.
Coding tip
Confirm whether the record names the right, left, or unspecified posterior cerebral artery before assigning I66.29.