I66: Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction
I66.2: Occlusion and stenosis of posterior cerebral artery
I66.21: Occlusion and stenosis of right posterior cerebral artery
I66.22: Occlusion and stenosis of left posterior cerebral artery
I66.23: Occlusion and stenosis of bilateral posterior cerebral arteries
I66.29: Occlusion and stenosis of unspecified posterior cerebral artery
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