| I66 | Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction | NON-BILLABLE CODE |
| I66.0 | Occlusion and stenosis of middle cerebral artery | NON-BILLABLE CODE |
| I66.01 | Occlusion and stenosis of right middle cerebral artery | BILLABLE CODE |
| I66.02 | Occlusion and stenosis of left middle cerebral artery | BILLABLE CODE |
| I66.03 | Occlusion and stenosis of bilateral middle cerebral arteries | BILLABLE CODE |
| I66.09 | Occlusion and stenosis of unspecified middle cerebral artery | BILLABLE CODE |
| I66.1 | Occlusion and stenosis of anterior cerebral artery | NON-BILLABLE CODE |
| I66.11 | Occlusion and stenosis of right anterior cerebral artery | BILLABLE CODE |
| I66.12 | Occlusion and stenosis of left anterior cerebral artery | BILLABLE CODE |
| I66.13 | Occlusion and stenosis of bilateral anterior cerebral arteries | BILLABLE CODE |
| I66.2 | Occlusion and stenosis of posterior cerebral artery | NON-BILLABLE CODE |
| I66.21 | Occlusion and stenosis of right posterior cerebral artery | BILLABLE CODE |
| I66.22 | Occlusion and stenosis of left posterior cerebral artery | BILLABLE CODE |
| I66.23 | Occlusion and stenosis of bilateral posterior cerebral arteries | BILLABLE CODE |
| I66.29 | Occlusion and stenosis of unspecified posterior cerebral artery | BILLABLE CODE |
| I66.3 | Occlusion and stenosis of cerebellar arteries | BILLABLE CODE |
| I66.8 | Occlusion and stenosis of other cerebral arteries | BILLABLE CODE |
| I66.9 | Occlusion and stenosis of unspecified cerebral artery | BILLABLE CODE |
