| I65 | Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction | NON-BILLABLE CODE |
| I65.0 | Occlusion and stenosis of vertebral artery | NON-BILLABLE CODE |
| I65.01 | Occlusion and stenosis of right vertebral artery | BILLABLE CODE |
| I65.02 | Occlusion and stenosis of left vertebral artery | BILLABLE CODE |
| I65.03 | Occlusion and stenosis of bilateral vertebral arteries | BILLABLE CODE |
| I65.09 | Occlusion and stenosis of unspecified vertebral artery | BILLABLE CODE |
| I65.1 | Occlusion and stenosis of basilar artery | BILLABLE CODE |
| I65.2 | Occlusion and stenosis of carotid artery | NON-BILLABLE CODE |
| I65.21 | Occlusion and stenosis of right carotid artery | BILLABLE CODE |
| I65.22 | Occlusion and stenosis of left carotid artery | BILLABLE CODE |
| I65.23 | Occlusion and stenosis of bilateral carotid arteries | BILLABLE CODE |
| I65.29 | Occlusion and stenosis of unspecified carotid artery | BILLABLE CODE |
| I65.8 | Occlusion and stenosis of other precerebral arteries | BILLABLE CODE |
