ICD-10 Code I63.421 – Cerebral infarction due to embolism of right anterior cerebral artery (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I63.421 – Cerebral infarction due to embolism of right anterior cerebral artery
What it is
This code identifies an ischemic stroke caused by an embolus blocking the right anterior cerebral artery. It means brain tissue on the right ACA territory has been injured by reduced blood flow.
Clinical signs
Findings often include sudden focal neurologic deficits consistent with a right ACA stroke. Clinical features vary; refer to documentation for laterality, imaging results, and the specific embolic source.
When to use this code
Use I63.421 when the record states cerebral infarction from embolism in the right anterior cerebral artery. You should code it when provider documentation or imaging supports an acute infarct in that vascular territory. If the source is uncertain, check documentation before assigning laterality-specific coding.
Do not use for
Do not use this code for hemorrhagic stroke, transient ischemic attack, or infarction in a different artery territory. Do not assign it when embolic cause or right ACA involvement is not documented.
Coding tip
Verify both the embolic mechanism and the right anterior cerebral artery location in the note or imaging report before coding.