Cereb infrc due to unsp occls or stenos of bi post cereb art

This code signifies a cerebral infarction (ischemic stroke) that has occurred in both posterior cerebral arteries, where the specific cause of the occlusion or stenosis (e.g., thrombus, embolus) is not documented. It indicates damage to brain tissue due to a lack of blood flow in the posterior circulation affecting both sides.

Use this code when documentation clearly states an ischemic stroke affecting both posterior cerebral arteries, and the physician has not specified the nature of the occlusion or stenosis. This code is appropriate when imaging (e.g., MRI, CT) confirms bilateral posterior cerebral artery infarction but the etiology of the blockage remains undetermined.

• Ensure documentation explicitly states "bilateral" involvement of the posterior cerebral arteries.
• Do not use if the specific type of occlusion (e.g., embolic, thrombotic) is identified; instead, select a more specific I63.x code.
• Always sequence this code after any associated symptoms or sequelae of the stroke, if applicable.