ICD-10-CM > I00-I99 > I60-I69 > I66 > I66.2 I66.2 Occlusion and stenosis of posterior cerebral artery Non-Billable/Non-Specific Codes I66.21Occlusion and stenosis of right posterior cerebral arteryI66.22Occlusion and stenosis of left posterior cerebral arteryI66.23Occlusion and stenosis of bilateral posterior cerebral arteriesI66.29Occlusion and stenosis of unspecified posterior cerebral artery