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

Non-billable header with 6 child codes.

Includes

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

Excludes1 (never code together)

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

Applies from I66 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

Excludes1 (never code together)

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

Codes under I66

• 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

Code annotations containing back-references to I66

Back-references to I66

• Type 1 Excludes: G31.84 Mild cognitive impairment of uncertain or unknown etiology ("cerebrovascular diseases (I60-I69)")
• Code First: G46 Vascular syndromes of brain in cerebrovascular diseases ("underlying cerebrovascular disease (I60-I69)")
• Type 2 Excludes: I10 Essential (primary) hypertension ("essential (primary) hypertension involving vessels of brain (I60-I69)")
• Type 2 Excludes: I15 Secondary hypertension ("secondary hypertension involving vessels of brain (I60-I69)")
• Type 2 Excludes: I74 Arterial embolism and thrombosis ("cerebral embolism and thrombosis (I63.3-I63.5, I66.-)")

Back-references to I66

• Type 1 Excludes: G31.84 Mild cognitive impairment of uncertain or unknown etiology ("cerebrovascular diseases (I60-I69)")
• Code First: G46 Vascular syndromes of brain in cerebrovascular diseases ("underlying cerebrovascular disease (I60-I69)")
• Type 2 Excludes: I10 Essential (primary) hypertension ("essential (primary) hypertension involving vessels of brain (I60-I69)")
• Type 2 Excludes: I15 Secondary hypertension ("secondary hypertension involving vessels of brain (I60-I69)")
• Type 2 Excludes: I74 Arterial embolism and thrombosis ("cerebral embolism and thrombosis (I63.3-I63.5, I66.-)")

Nearby codes

• I66 Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction (this code)
• 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