ICD-10 Code I63.22 – Cerebral infarction due to unspecified occlusion or stenosis of basilar artery (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I63.22 – Cerebral infarction due to unspecified occlusion or stenosis of basilar artery
What it is
This code identifies an ischemic stroke caused by reduced blood flow in the basilar artery, with the occlusion or stenosis not further specified. Use it when documentation links the infarction to the basilar artery.
Clinical signs
Clinical features vary; refer to documentation. Common findings in basilar artery infarction may include sudden neurologic deficits such as weakness, speech difficulty, vision changes, dizziness, or impaired consciousness.
When to use this code
Use I63.22 when the record clearly states cerebral infarction due to unspecified occlusion or stenosis of the basilar artery. It also fits when imaging or provider assessment identifies a basilar artery ischemic stroke but does not specify the exact obstructive cause.
Code the documented stroke event, not old residual deficits or a history of stroke. If the chart names a different cerebral artery or gives a non-ischemic diagnosis, choose another code. Check documentation when the vessel or mechanism is unclear.
Do not use for
Do not use this code for hemorrhagic stroke, transient ischemic attack, or cerebral infarction from a different artery. Avoid it when the provider documents only basilar artery stenosis without infarction.
Coding tip
Verify that both infarction and basilar artery involvement are documented before assigning I63.22.