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

This diagnosis code signifies a stroke resulting from a blockage or narrowing within a posterior cerebral artery, where the specific nature of the occlusion/stenosis and the exact posterior cerebral artery involved are not documented. It indicates ischemic damage to brain tissue supplied by the posterior circulation.

Use this code when documentation confirms a cerebral infarction in the posterior circulation, but the physician has not specified the type of occlusion (e.g., thrombosis, embolism) or the exact posterior cerebral artery (e.g., left, right). This code is appropriate when the medical record explicitly states "unspecified occlusion/stenosis of unspecified posterior cerebral artery" or provides insufficient detail to assign a more specific code.

• Avoid using this code if the laterality (left/right) of the posterior cerebral artery or the specific type of occlusion/stenosis is documented; instead, select a more precise I63.53- subcategory.
• Always query the provider for more specific information regarding the occlusion type and laterality to allow for more granular coding, if possible.
• Sequence this code after any acute cerebrovascular disease codes (e.g., G45.-) if the infarction is a sequela of a transient ischemic attack.