When is ICD-10 code G45 used?

Doctors, hospitals, and insurers may use ICD-10 code G45 when recording transient cerebral ischemic attacks and related syndromes in a standardized format. This entry may also act as a broader category that points toward more specific child codes.

Does ICD-10 code G45 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10

ICD-10 Code G45: Transient cerebral ischemic attacks and related syndromes

Name: ICD-10 Code G45: Transient cerebral ischemic attacks and related syndromes
Creator: HealthAssure Clinical Team
Published: 2026-05-21T06:07:05.682Z

G45 is an ICD-10 diagnosis entry used to group records related to Transient cerebral ischemic attacks and related syndromes. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the nervous system (G00-G99).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. 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 cerebral ischemic attacks and related syndromes in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

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.
This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter

6Diseases of the nervous system (G00-G99)

block

G40-G47Episodic and paroxysmal disorders

currentG40-G47

Official coding notes

Excludes1 (do not code together)

neonatal cerebral ischemia (P91.0)
transient retinal artery occlusion (H34.0-)

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

NeurologistGeneral Physician

Sibling codes

G40Epilepsy and recurrent seizures G43Migraine G44Other headache syndromes G46Vascular syndromes of brain in cerebrovascular diseases G47Sleep disorders

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.

Legacy codes

G45

Replacement codes

G45.0 — Vertebro-basilar artery syndromeG45.1 — Carotid artery syndrome (hemispheric)G45.2 — Multiple and bilateral precerebral artery syndromesG45.3 — Amaurosis fugaxG45.4 — Transient global amnesiaG45.8 — Other transient cerebral ischemic attacks and related syndromesG45.9 — Transient cerebral ischemic attack, unspecified

Common synonyms

Transient cerebral ischemic attacks and related syndromes

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.