Cerebrovascular diseases (I60-I69)
I65: Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction

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

excludes1
insufficiency, NOS, of precerebral artery (G45.-)
insufficiency of precerebral arteries causing cerebral infarction (I63.0-I63.2)
I65.0: Occlusion and stenosis of vertebral artery
I65.1: Occlusion and stenosis of basilar artery
I65.2: Occlusion and stenosis of carotid artery
I65.8: Occlusion and stenosis of other precerebral arteries
I65.9: Occlusion and stenosis of unspecified precerebral artery

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