Cerebrovascular diseases (I60-I69)
I66: Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction

includes
embolism of cerebral artery
narrowing of cerebral artery
obstruction (complete) (partial) of cerebral artery
thrombosis of cerebral artery

excludes1
Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5)
I66.0: Occlusion and stenosis of middle cerebral artery
I66.1: Occlusion and stenosis of anterior cerebral artery
I66.2: Occlusion and stenosis of posterior cerebral artery
I66.3: Occlusion and stenosis of cerebellar arteries
I66.8: Occlusion and stenosis of other cerebral arteries
I66.9: Occlusion and stenosis of unspecified cerebral artery

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