Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction - I66

This notation helps users understand the scope of a code I66 category and provides additional information about the conditions or terms that fall under that category.

Category Includes:

embolism of cerebral artery
narrowing of cerebral artery
obstruction (complete) (partial) of cerebral artery
thrombosis of cerebral artery

Excludes1: It indicates that the conditions described by two codes cannot occur together in the same patient. These codes are mutually exclusive.

Type 1 Excludes:

Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5)

These ranges represents subcategories of Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction. The "I66" signifies that these are the diseases within this broad category.

Codes:

I66.0 - Occlusion and stenosis of middle cerebral artery
I66.01 - Occlusion and stenosis of right middle cerebral artery
I66.02 - Occlusion and stenosis of left middle cerebral artery
I66.03 - Occlusion and stenosis of bilateral middle cerebral arteries
I66.09 - Occlusion and stenosis of unspecified middle cerebral artery
I66.1 - Occlusion and stenosis of anterior cerebral artery
I66.11 - Occlusion and stenosis of right anterior cerebral artery
I66.12 - Occlusion and stenosis of left anterior cerebral artery
I66.13 - Occlusion and stenosis of bilateral anterior cerebral arteries
I66.19 - Occlusion and stenosis of unspecified anterior cerebral artery
I66.2 - Occlusion and stenosis of posterior cerebral artery
I66.21 - Occlusion and stenosis of right posterior cerebral artery
I66.22 - Occlusion and stenosis of left posterior cerebral artery
I66.23 - Occlusion and stenosis of bilateral posterior cerebral arteries
I66.29 - Occlusion and stenosis of unspecified 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