ICD10BillableValid for clinical use
ICD-10 Code I65.1: Occlusion and stenosis of basilar artery
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 basilar artery 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
I65Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction
currentI65
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
Sibling codes
Coverage-related procedures and services
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
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
Mapped diagnoses and classifications
SNOMED_CT 703206009high
Asymptomatic occlusion of basilar artery
Source: SNOMED International ICD-10 map
SNOMED_CT 1204164005high
Asymptomatic stenosis of basilar artery
Source: SNOMED International ICD-10 map
SNOMED_CT 111296006high
Basilar artery embolism
Source: SNOMED International ICD-10 map
SNOMED_CT 195180004high
Basilar artery occlusion
Source: SNOMED International ICD-10 map
SNOMED_CT 54519002high
Basilar artery stenosis
Source: SNOMED International ICD-10 map
SNOMED_CT 88174006high
Basilar artery thrombosis
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy and official ICD code match exactly.
Legacy codes
I65.1
Common synonyms
Occlusion and stenosis of basilar artery
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.