ICD-10 Code I63.12 – Cerebral infarction due to embolism of basilar artery (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I63.12 – Cerebral infarction due to embolism of basilar artery
What it is
This code identifies an ischemic stroke caused by an embolus blocking the basilar artery. It means brain tissue was injured because blood flow to the posterior circulation was suddenly reduced.
Clinical signs
Typical findings include acute neurologic deficits such as dizziness, double vision, dysarthria, weakness, ataxia, or altered consciousness. Clinical features vary; refer to documentation.
When to use this code
Use I63.12 when the provider documents cerebral infarction from embolism of the basilar artery, including confirmed stroke imaging or specialist assessment. You may also use it when the record clearly links the infarct to a basilar embolic source. Check documentation if the artery or mechanism is uncertain.
Do not use for
Do not use this code for hemorrhagic stroke, transient ischemic attack, or infarction from thrombosis without embolism. Do not assign it if the basilar artery involvement is not documented.
Coding tip
Code the documented stroke mechanism and vessel site exactly as stated; if embolism is not specified, query the provider.