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)
- traumatic intracranial hemorrhage (S06.-)
- Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5)
Excludes 2
Conditions not included here, but the patient may have both
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- systemic connective tissue disorders (M30-M36)
- transient cerebral ischemic attacks and related syndromes (G45.-)
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
Also Known As / Clinical Terms
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 ICD-10 code I66?
ICD-10-CM code I66 represents "Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction". It 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 you should also code: code to identify 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.
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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.