I66 is a non-billable/non-specific diagnosis code from the 2025 ICD-10-CM used to classify the following condition: Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction.
Includes
Embolism of cerebral artery
Narrowing of cerebral artery
Obstruction (complete) (partial) of cerebral artery
Thrombosis of cerebral artery
Type 1 excludes
Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5)
Codes
I66.0
Occlusion and stenosis of middle cerebral artery
I66.1
Occlusion and stenosis of anterior cerebral artery
I66.2
Occlusion and stenosis of posterior cerebral artery
I66.3
Occlusion and stenosis of cerebellar arteries
I66.8
Occlusion and stenosis of other cerebral arteries
I66.9
Occlusion and stenosis of unspecified cerebral artery
Versions
2025
No changes
2024
No changes
2023
No changes
2022
No changes
2021
No changes
2020
No changes
2019
No changes
2018
No changes
2017
No changes
2016
New code