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

This diagnosis code signifies a stroke resulting from a blockage or narrowing within the left posterior cerebral artery, where the specific nature of the occlusion or stenosis is not documented. It indicates brain tissue death due to insufficient blood supply in the territory supplied by this vessel.

Apply this code when medical records clearly state a cerebral infarction affecting the left posterior cerebral artery, and the documentation does not specify whether the occlusion is embolic, thrombotic, or due to other defined causes. Supporting documentation includes imaging reports (e.g., MRI, CT scan) confirming infarction in the relevant vascular territory and physician notes indicating the affected vessel and unspecified etiology.

• Ensure the laterality (left) and the specific artery (posterior cerebral) are explicitly documented.
• Only use this code when the type of occlusion or stenosis (e.g., embolic, thrombotic) is truly unspecified in the medical record.
• Sequence this code after any codes for underlying conditions that may have contributed to the infarction, such as atherosclerosis or atrial fibrillation.