ICD-10 Code I63.321 – Cerebral infarction due to thrombosis of right anterior cerebral artery (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I63.321 – Cerebral infarction due to thrombosis of right anterior cerebral artery
What it is
This code identifies an ischemic stroke caused by a blood clot blocking the right anterior cerebral artery. The blockage reduces blood flow to part of the brain supplied by that artery.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include sudden focal neurologic deficits consistent with right ACA territory involvement, such as weakness or sensory loss affecting the left leg more than the arm.
When to use this code
Use this code when the provider documents cerebral infarction due to thrombosis of the right anterior cerebral artery. It applies when imaging or clinical assessment supports an ischemic infarct in that vascular territory. Check documentation if the artery laterality or mechanism is unclear.
Do not use for
Do not use this code for hemorrhagic stroke, transient ischemic attack, or cerebral infarction without documented right ACA thrombosis. If the record names a different vessel or etiology, code the documented condition instead.
Coding tip
Verify both the infarct type and the exact artery side before assigning I63.321.