ICD-10-CM > I00-I99 > I60-I69 > I66 > I66.1 I66.1 Occlusion and stenosis of anterior cerebral artery Non-Billable/Non-Specific Codes I66.11Occlusion and stenosis of right anterior cerebral arteryI66.12Occlusion and stenosis of left anterior cerebral arteryI66.13Occlusion and stenosis of bilateral anterior cerebral arteriesI66.19Occlusion and stenosis of unspecified anterior cerebral artery