ICD10BillableValid for clinical use
ICD-10 Code I63.239: Cerebral infarction due to unspecified occlusion or stenosis of unspecified carotid 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).
đź“‹Clinical overview
This ICD-10 code is commonly used when documentation describes cerebral infarction attributed to unspecified occlusion or stenosis of a precerebral artery. The most accurate code depends on whether the record later clarifies the exact artery or a more specific thrombotic versus embolic mechanism.
When is it used?
- May be used when a clinician documents cerebral infarction due to unspecified occlusion or stenosis of unspecified carotid 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.
đź©şClinical context
When commonly used
- Stroke, neurology, inpatient, and utilization-review documentation where ischemic stroke is linked to precerebral arterial occlusion but the record does not clearly distinguish thrombosis from embolism.
- Coding workflows where the chart identifies vertebral, basilar, carotid, unspecified, or another precerebral artery but preserves broader occlusion or stenosis language.
Common management context
- Evaluation often includes neurologic examination, vascular imaging review, acute-stroke assessment context, and follow-up of ischemic deficits or stroke-risk factors.
- Documentation usually becomes more specific when the chart clarifies whether the occlusive event is thrombotic versus embolic and names the exact artery involved.
- Specialist context already linked on this page includes Cardiologist, General Physician, Neurologist, Stroke Specialist.
🔍Key distinctions
Important notes
- These ICD-10 codes describe ischemic stroke attributed to a broader unspecified occlusion or stenosis pattern in a precerebral artery rather than clearly documented thrombosis or embolism.
- Specific artery detail such as carotid, vertebral, basilar, or other precerebral involvement can change the final code.
- This title reflects unspecified artery detail; if the chart names the affected vessel more clearly, a more specific cerebral-infarction code may be used.
- Within the precerebral-artery branch, documentation that names vertebral, basilar, carotid, or another precerebral artery changes code specificity.
- Documentation that attributes cerebral infarction to unspecified occlusion or stenosis of precerebral arteries is coded differently from infarction due to thrombosis or embolism of similar precerebral arteries.
Related codes to consider
I63.231Cerebral infarction due to unspecified occlusion or stenosis of right carotid arteries
Related cerebral-infarction ICD-10 code; documentation often becomes more specific when the chart identifies thrombosis versus embolism, the exact artery, laterality, or another occlusive mechanism.
I63.232Cerebral infarction due to unspecified occlusion or stenosis of left carotid arteries
Related cerebral-infarction ICD-10 code; documentation often becomes more specific when the chart identifies thrombosis versus embolism, the exact artery, laterality, or another occlusive mechanism.
I63.233Cerebral infarction due to unspecified occlusion or stenosis of bilateral carotid arteries
Related cerebral-infarction ICD-10 code; documentation often becomes more specific when the chart identifies thrombosis versus embolism, the exact artery, laterality, or another occlusive mechanism.
Code hierarchy
chapter
9Diseases of the circulatory system (I00-I99)
block
I60-I69Cerebrovascular diseases
category
I63Cerebral infarction
category
I63.2Cerebral infarction due to unspecified occlusion or stenosis of precerebral arteries
category
I63.23Cerebral infarction due to unspecified occlusion or stenosis of carotid arteries
currentI63.23
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 PhysicianNeurologistStroke Specialist
Related codes
Sibling codes
I63.231Cerebral infarction due to unspecified occlusion or stenosis of right carotid arteriesbillableI63.232Cerebral infarction due to unspecified occlusion or stenosis of left carotid arteriesbillableI63.233Cerebral infarction due to unspecified occlusion or stenosis of bilateral carotid arteriesbillable
Coverage-related procedures and services
CPT 0937Thigh
EXTERNAL ELECTROCARDIOGRAPHIC RECORDING FOR GREATER THAN 15 DAYS UP TO 30 DAYS BY CONTINUOUS RHYTHM RECORDING AND STORAGE; INCLUDING RECORDING, SCANNING ANALYSIS WITH REPORT, REVIEW AND INTERPRETATION BY A PHYSICIAN OR OTHER QUALIFIED HEALTH CARE PROFESSIONAL
Source: CMS coverage guidance
CPT 0938Thigh
EXTERNAL ELECTROCARDIOGRAPHIC RECORDING FOR GREATER THAN 15 DAYS UP TO 30 DAYS BY CONTINUOUS RHYTHM RECORDING AND STORAGE; RECORDING (INCLUDING CONNECTION AND INITIAL RECORDING)
Source: CMS coverage guidance
CPT 0940Thigh
EXTERNAL ELECTROCARDIOGRAPHIC RECORDING FOR GREATER THAN 15 DAYS UP TO 30 DAYS BY CONTINUOUS RHYTHM RECORDING AND STORAGE; REVIEW AND INTERPRETATION BY A PHYSICIAN OR OTHER QUALIFIED HEALTH CARE PROFESSIONAL
Source: CMS coverage guidance
CPT 0939Thigh
EXTERNAL ELECTROCARDIOGRAPHIC RECORDING FOR GREATER THAN 15 DAYS UP TO 30 DAYS BY CONTINUOUS RHYTHM RECORDING AND STORAGE; SCANNING ANALYSIS WITH REPORT
Source: CMS coverage guidance
CPT 93241high
EXTERNAL ELECTROCARDIOGRAPHIC RECORDING FOR MORE THAN 48 HOURS UP TO 7 DAYS BY CONTINUOUS RHYTHM RECORDING AND STORAGE; INCLUDES RECORDING, SCANNING ANALYSIS WITH REPORT, REVIEW AND INTERPRETATION
Source: CMS coverage guidance
CPT 93242high
EXTERNAL ELECTROCARDIOGRAPHIC RECORDING FOR MORE THAN 48 HOURS UP TO 7 DAYS BY CONTINUOUS RHYTHM RECORDING AND STORAGE; RECORDING (INCLUDES CONNECTION AND INITIAL RECORDING)
Source: CMS coverage guidance
Coding guidelines
Common synonyms
Cerebral infarction due to unspecified occlusion or stenosis of unspecified carotid arteryCerebral infarction due to occlusion or stenosis of carotid 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.