I66
Non-billableOccls and stenosis of cereb art, not rslt in cerebral infrc
Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction
This is a header/category code. For billing purposes, use a more specific child code from the list below.
Coding Notes
Includes
Conditions included under this code
- embolism of cerebral artery
- narrowing of cerebral artery
- obstruction (complete) (partial) of cerebral artery
- thrombosis of cerebral artery
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
Excludes 2
Conditions not included here, but the patient may have both
- •certain conditions originating in the perinatal periodP04-P96
- •certain infectious and parasitic diseasesA00-B99
- •complications of pregnancy, childbirth and the puerperiumO9A)O00
- •congenital malformations, deformations, and chromosomal abnormalitiesQ00-Q99
- •endocrine, nutritional and metabolic diseasesE00-E88
- •injury, poisoning and certain other consequences of external causesS00-T88
- •neoplasmsC00-D49
- •symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedR00-R94
- •systemic connective tissue disordersM30-M36
- •transient cerebral ischemic attacks and related syndromesG45
Use Additional Code
Additional codes that should follow this code
Child Codes (6)
I66.0Occlusion and stenosis of middle cerebral artery
I66.1Occlusion and stenosis of anterior cerebral artery
I66.2Occlusion and stenosis of posterior cerebral artery
I66.3Occlusion and stenosis of cerebellar arteries
I66.8Occlusion and stenosis of other cerebral arteries
I66.9Occlusion and stenosis of unspecified cerebral artery
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(35)
UMLS
- Cerebral EmboliC0007780
- Cerebral EmbolismC0007780
- Cerebral EmbolusC0007780
- Cerebral arterial embolismC0007780
- Cerebral artery embolismC0007780
- Cerebral embolismC0007780
- Cerebral embolism (disorder)C0007780
- Cerebral embolism (vessel unspecified)C0007780
- Emboli, CerebralC0007780
- Embolism cerebralC0007780
- Embolism, CerebralC0007780
- Embolus cerebralC0007780
- Embolus, CerebralC0007780
- arteries cerebral embolismC0007780
- cerebral artery embolismC0007780
- cerebral emboliC0007780
- cerebral embolismC0007780
- cerebral embolismsC0007780
- cerebral embolusC0007780
- embolism of cerebral arteryC0007780
- Cerebral arterial thrombosisC0795687
- Cerebral artery thrombosisC0795687
- Cerebral thrombosisC0795687
- Thrombosis cerebral arterialC0795687
- Thrombosis of cerebral arteryC0795687
- Thrombosis of cerebral artery (disorder)C0795687
- Thrombus of cerebral arteryC0795687
- cerebral arterial thrombosisC0795687
- cerebral artery thrombosisC0795687
- cerebral thrombosisC0795687
- thrombosis of cerebral arteryC0795687
- Occls and stenosis of cereb art, not rslt in cerebral infrcC0348832
- Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarctionC0348832
- narrowing of cerebral arteryC1410909
- obstruction (complete) (partial) of cerebral arteryC4290147
Frequently Asked Questions
What is the ICD-10 code for occls and stenosis of cereb art, not rslt in cerebral infrc?
The ICD-10-CM code for occls and stenosis of cereb art, not rslt in cerebral infrc is I66. The full clinical description is "Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction". I66 is a non-billable header code. Use a more specific child code for billing purposes.
What does ICD-10 code I66 mean?
ICD-10-CM code I66 represents “Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction”. It is classified under Chapter 9: Diseases of the Circulatory System and is a non-billable header code. Use a more specific child code for billing purposes.
Is I66 a billable code?
No, I66 is a non-billable header code. You need to use one of its more specific child codes for billing. There are 6 child codes under I66.
What chapter is I66 in?
I66 is in Chapter 9: Diseases of the Circulatory System (codes I00-I99).
What codes cannot be used with I66?
I66 has Excludes1 notes indicating codes that cannot be used together with it, including: traumatic intracranial hemorrhage (S06.-); Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5).
What are the subcategories under I66?
I66 has 6 child codes, including: 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), and 2 more.
Are additional codes required with I66?
Yes, when using I66, also report: presence of:; alcohol abuse and dependence (F10.-); exposure to environmental tobacco smoke (Z77.22); history of tobacco dependence (Z87.891); hypertension (I10-I1A); occupational exposure to environmental tobacco smoke (Z57.31); tobacco dependence (F17.-); tobacco use (Z72.0).
What are the UMLS CUIs for I66?
I66 is linked to 5 UMLS Concept Unique Identifiers: C0007780, C0795687, C0348832, C1410909, C4290147. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does I66 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like occls and stenosis of cereb art, not rslt in cerebral infrc affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of I66?
I66 maps to the ICD-11 code: 8B2Z (Cerebrovascular diseases, unspecified).
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.