ICD-10 Code I63.529 – Cerebral infarction due to unspecified occlusion or stenosis of unspecified anterior cerebral artery (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I63.529 – Cerebral infarction due to unspecified occlusion or stenosis of unspecified anterior cerebral artery
What it is
This code identifies an ischemic stroke in the anterior cerebral artery territory when the artery is not further specified and the occlusion or stenosis is also unspecified. Use it for a documented cerebral infarction affecting that vascular distribution.
Clinical signs
Clinical features vary; refer to documentation. Findings may include sudden focal neurologic deficits consistent with ACA territory infarction, such as leg-predominant weakness, altered sensation, or impaired behavior and judgment.
When to use this code
Use this code when the record states cerebral infarction due to unspecified occlusion or stenosis of an unspecified anterior cerebral artery. It fits cases where imaging or provider documentation confirms infarction, but the exact vessel side or lesion detail is not named.
Choose it only after reviewing the note, imaging report, and discharge summary for the most specific documented stroke mechanism. If the documentation identifies a different artery, a hemorrhagic event, or a non-infarction diagnosis, select the more accurate code.
Do not use for
Do not use this code for transient ischemic attack, hemorrhagic stroke, or infarction in a different vascular territory. Check documentation if the record does not clearly support anterior cerebral artery involvement.
Coding tip
Code to the highest documented specificity, and query the provider if the side, vessel, or occlusion details are missing.