Cereb infrc due to unsp occls or stenosis of basilar artery

This diagnosis code signifies a stroke resulting from a blockage or narrowing of the basilar artery, where the specific nature of the occlusion or stenosis (e.g., thrombosis, embolism) is not documented. The basilar artery supplies blood to vital structures in the brainstem and cerebellum, so infarction in this region can lead to severe neurological deficits.

Apply this code when medical record documentation clearly states a cerebral infarction due to basilar artery involvement, but the etiology of the occlusion or stenosis is not specified. This is appropriate for cases where imaging (e.g., MRI, CT angiography) confirms the infarction and basilar artery compromise, but further detail on the cause of the blockage is absent.

• Ensure documentation explicitly links the cerebral infarction to the basilar artery.
• Avoid using this code if the specific cause of the occlusion (e.g., thrombosis, embolism) is documented; instead, use a more specific I63.0- or I63.1- code.
• Always sequence this code after any underlying conditions contributing to the infarction, such as atherosclerosis, if documented.