ICD-10 Code I63.322 – Cerebral infarction due to thrombosis of left anterior cerebral artery (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I63.322 – Cerebral infarction due to thrombosis of left anterior cerebral artery
What it is
This code identifies an ischemic stroke caused by a blood clot blocking the left anterior cerebral artery. Use it when documentation specifies infarction in that arterial territory.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include sudden neurologic deficits consistent with anterior cerebral artery territory involvement, such as contralateral leg weakness, sensory loss, or changes in behavior or judgment.
When to use this code
Use I63.322 when the provider documents cerebral infarction due to thrombosis of the left anterior cerebral artery. It applies when imaging, clinical assessment, or discharge diagnosis supports that specific vessel and side.
If the record only states ischemic stroke, cerebral infarction, or anterior cerebral artery stroke without laterality or thrombosis detail, check documentation before assigning this code.
Do not use for
Do not use this code for hemorrhagic stroke, transient ischemic attack, or infarction from another cerebral artery. Do not assume laterality or mechanism if the record does not clearly state them.
Coding tip
Confirm both the left side and thrombosis cause in the provider note before coding.