2026 ICD-10-CM Diagnosis Code G45Transient cerebral ischemic attacks and related syndromes

ICD-10-CM Codes›G00–G99›G40-G47›G45

ICD-10-CM G45
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G45 is a non-billable ICD-10-CM category code for transient cerebral ischemic attacks and related syndromes, so it cannot be submitted on claims. Use a more specific code from this category instead, such as G45.0, G45.1, G45.2, and G45.3.

Code Identity

ICD-10-CM Code
G45
Billable Status
No — Non-Billable Category
Code Describes
Transient cerebral ischemic attacks and related syndromes
Chapter
G40-G47
Episodic and paroxysmal disorders

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG40-G47Episodic and paroxysmal disorders
CategoryG45Transient cerebral ischemic attacks and related syndromes
This CodeG45Transient cerebral ischemic attacks and related syndromes

Specific Coding for Transient cerebral ischemic attacks and related syndromesOverview

Non-specific codes like G45 require more characters. Use one of these billable codes instead:

  • Use G45.0 for Vertebro-basilar artery syndrome

  • Use G45.1 for Carotid artery syndrome (hemispheric)

  • Use G45.2 for Multiple and bilateral precerebral artery syndromes

  • Use G45.3 for Amaurosis fugax

  • Use G45.4 for Transient global amnesia

  • Use G45.8 for Other transient cerebral ischemic attacks and related syndromes

  • Use G45.9 for Transient cerebral ischemic attack, unspecified

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 1 Excludes

  • neonatal cerebral ischemia P91.0
  • transient retinal artery occlusion H34.0

Patient EducationClinical

Transient Ischemic Attack

A transient ischemic attack (TIA) is a stroke that lasts only a few minutes. It happens when the blood supply to part of the brain is briefly blocked. Symptoms of a TIA are like other stroke symptoms, but do not last as long. They happen suddenly, and include:

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Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About G45Overview

Is G45 (Transient cerebral ischemic attacks and related syndromes) a billable code?

No. This is a category header that groups the codes for transient cerebral ischemic attacks and related syndromes, and headers cannot be submitted on claims. Claims for transient cerebral ischemic attacks and related syndromes need a more specific code from this category, such as G45.0, G45.1, and G45.2.