ICD-10 Code I65.8 – Occlusion and stenosis of other precerebral arteries (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I65.8 – Occlusion and stenosis of other precerebral arteries
What it is
I65.8 identifies narrowing or blockage of a precerebral artery other than the carotid or vertebral vessels specifically named elsewhere. Use it when documentation shows atherosclerotic or other occlusive disease in these arteries.
Clinical signs
Clinical features vary; refer to documentation. Patients may have neurologic symptoms from reduced cerebral blood flow, such as transient ischemic attacks, dizziness, weakness, or speech changes, but the record should confirm the affected artery.
When to use this code
Use this code when the provider documents stenosis or occlusion of a precerebral artery not captured by a more specific ICD-10 option. It is appropriate for imaging-confirmed disease or a clear clinical diagnosis in the chart. If the note identifies a different vessel or a more specific stenosis code, choose that code instead.
Do not use for
Do not use I65.8 for carotid or vertebral artery stenosis when a specific code is available. Also avoid it when the documentation only says cerebrovascular disease without identifying occlusion or stenosis.
Coding tip
Check the vessel named in imaging or the assessment and code the most specific precerebral artery diagnosis documented.