ICD10BillableValid for clinical use
ICD-10 Code G45.4: Transient global amnesia
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 nervous system (G00-G99).
When is it used?
- May be used when a clinician documents transient global amnesia 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
6Diseases of the nervous system (G00-G99)
block
G40-G47Episodic and paroxysmal disorders
category
G45Transient cerebral ischemic attacks and related syndromes
currentG45
Official coding notes
Excludes1 (do not code together)
- amnesia NOS (R41.3)
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
NeurologistGeneral Physician
Related codes
Sibling codes
G45.0Vertebro-basilar artery syndromebillableG45.1Carotid artery syndrome (hemispheric)billableG45.2Multiple and bilateral precerebral artery syndromesbillableG45.3Amaurosis fugaxbillableG45.8Other transient cerebral ischemic attacks and related syndromesbillableG45.9Transient cerebral ischemic attack, unspecifiedbillable
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
Coding guidelines
Compatibility
Legacy and official ICD code match exactly.
Legacy codes
G45.4
Common synonyms
Transient global amnesia
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.