ICD10BillableValid for clinical use
ICD-10 Code I66.8: Occlusion and stenosis of other cerebral arteries
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the circulatory system (I00-I99).
When is it used?
- May be used when a clinician documents occlusion and stenosis of other cerebral arteries in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code can be used as a clinically usable diagnosis entry in standardized coding workflows.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
Code hierarchy
chapter
9Diseases of the circulatory system (I00-I99)
block
I60-I69Cerebrovascular diseases
category
I66Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction
currentI66
Official coding notes
Inclusion terms
- Occlusion and stenosis of perforating arteries
Where you may see this code
You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.
Related specialists
CardiologistGeneral Physician
Related codes
I66.0Occlusion and stenosis of middle cerebral arterycategoryI66.1Occlusion and stenosis of anterior cerebral arterycategoryI66.2Occlusion and stenosis of posterior cerebral arterycategoryI66.3Occlusion and stenosis of cerebellar arteriescodeI66.9Occlusion and stenosis of unspecified cerebral arterycode
Sibling codes
Coverage-related procedures and services
CPT 93880high
DUPLEX SCAN OF EXTRACRANIAL ARTERIES; COMPLETE BILATERAL STUDY
Source: CMS coverage guidance
CPT 93882high
DUPLEX SCAN OF EXTRACRANIAL ARTERIES; UNILATERAL OR LIMITED STUDY
Source: CMS coverage guidance
CPT 93886high
TRANSCRANIAL DOPPLER STUDY OF THE INTRACRANIAL ARTERIES; COMPLETE STUDY
Source: CMS coverage guidance
CPT 93892high
TRANSCRANIAL DOPPLER STUDY OF THE INTRACRANIAL ARTERIES; EMBOLI DETECTION WITHOUT INTRAVENOUS MICROBUBBLE INJECTION
Source: CMS coverage guidance
CPT 93888high
TRANSCRANIAL DOPPLER STUDY OF THE INTRACRANIAL ARTERIES; LIMITED STUDY
Source: CMS coverage guidance
CPT 93893high
TRANSCRANIAL DOPPLER STUDY OF THE INTRACRANIAL ARTERIES; VENOUS-ARTERIAL SHUNT DETECTION WITH INTRAVENOUS MICROBUBBLE INJECTION
Source: CMS coverage guidance
Mapped diagnoses and classifications
SNOMED_CT 7931000119101high
Anterior choroidal artery thrombosis
Source: SNOMED International ICD-10 map
SNOMED_CT 788455001high
Bilateral occlusion of pontine arteries
Source: SNOMED International ICD-10 map
SNOMED_CT 297138001high
Embolus of circle of Willis
Source: SNOMED International ICD-10 map
SNOMED_CT 870566003high
Occlusion of anterior choroidal artery
Source: SNOMED International ICD-10 map
SNOMED_CT 16023751000119106high
Occlusion of left anterior choroidal artery
Source: SNOMED International ICD-10 map
SNOMED_CT 735115007high
Occlusion of left pontine artery
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy and official ICD code match exactly.
Legacy codes
I66.8
Common synonyms
Occlusion and stenosis of other cerebral arteries
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.