Cereb infrc d/t unsp occls or stenos of right mid cereb art

This code signifies a stroke resulting from a blockage or narrowing within the right middle cerebral artery, where the specific cause of the occlusion (e.g., thrombus, embolus) is not documented. It indicates an ischemic event affecting the brain tissue supplied by this major artery.

Apply this code when documentation confirms a cerebral infarction localized to the right middle cerebral artery territory, but the physician's notes do not specify whether the occlusion was due to a thrombus, embolus, or other defined cause. This is appropriate when the laterality (right) and the vessel (middle cerebral artery) are known, but the etiology of the stenosis/occlusion remains unspecified.

• Ensure the documentation clearly states "right middle cerebral artery" and "unspecified occlusion or stenosis."
• Do not use this code if the cause of the occlusion (e.g., embolic, thrombotic) is specified; instead, select a more specific I63.4- or I63.3- code.
• Always sequence this code after any applicable sequelae of cerebrovascular disease (I69.-) if the patient is presenting for chronic effects of a past stroke.