ICD-10 Code I63.51 – Cerebral infarction due to unspecified occlusion or stenosis of middle cerebral artery (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I63.51 – Cerebral infarction due to unspecified occlusion or stenosis of middle cerebral artery
What it is
This code identifies an ischemic stroke caused by blockage or narrowing in a middle cerebral artery, when the side and exact vessel details are not specified. Use it when documentation confirms infarction but does not name a more specific MCA branch.
Clinical signs
Clinical features vary; refer to documentation. Typical middle cerebral artery stroke findings may include sudden weakness or numbness on one side, facial droop, speech or language disturbance, and visual field loss.
When to use this code
Use this code when the record documents cerebral infarction due to occlusion or stenosis of the middle cerebral artery, but does not specify left, right, or a more exact segment. It also fits when the provider states the MCA lesion is unspecified. Check documentation if laterality or a more precise vessel is available.
Do not use for
Do not use this code for hemorrhagic stroke, transient ischemic attack, or infarction tied to a different cerebral artery. If the chart names a more specific MCA branch or side, code that more specific diagnosis instead.
Coding tip
Look for laterality and vessel detail in the final provider note, imaging report, and discharge summary before defaulting to an unspecified MCA code.