ICD-10 Code I63.342 – Cerebral infarction due to thrombosis of left cerebellar artery (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I63.342 – Cerebral infarction due to thrombosis of left cerebellar artery
What it is
This code identifies an ischemic stroke caused by a blood clot blocking the left cerebellar artery. It applies when the infarction is documented as due to thrombosis in that specific artery.
Clinical signs
Clinical features vary; refer to documentation. Typical cerebellar stroke findings may include dizziness, gait unsteadiness, limb incoordination, nausea, or vomiting, but the record should support the vascular territory and thrombotic cause.
When to use this code
Use I63.342 when the provider documents cerebral infarction, ischemic stroke, or acute infarct due to thrombosis of the left cerebellar artery. The laterality and mechanism must be stated or clearly supported in the note.
Apply it for confirmed cerebellar ischemia in the left arterial distribution, not for nonspecific stroke descriptions. If the documentation names a different cerebellar vessel, or does not specify thrombosis, check documentation before assigning this code.
Do not use for
Do not use this code for hemorrhagic stroke, transient ischemic attack, or infarction from embolism or unspecified occlusion. It is also wrong when the left cerebellar artery is not documented.
Coding tip
Verify both the cause and the exact vessel before coding, because laterality and mechanism determine the correct I63 code.