G45.9 — Transient cerebral ischemic attack, unspecified

G45.9

ICD-10 Chapter 6: Nervous System — illustrative image — Chapter 6: Diseases of the nervous system (G00–G99) — illustrative image

What this code means

A transient ischaemic attack (TIA, 'mini-stroke') is a brief interruption of blood flow to the brain whose symptoms resolve within 24 hours.

Also called: tia, transient ischemic attack, mini stroke.

When this code is used

Used for transient cerebral ischaemic attack, unspecified.

Where it sits in ICD-10-CM

Code G45.9 belongs to Chapter 6: Diseases of the nervous system, which covers codes G00–G99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

Learn more about this condition

Condition guide: Stroke

Related symptoms

Related anatomy

Brain

Frequently asked questions

What is ICD-10-CM code G45.9?

G45.9 is the ICD-10-CM diagnosis code for “Transient cerebral ischemic attack, unspecified”. A transient ischaemic attack (TIA, 'mini-stroke') is a brief interruption of blood flow to the brain whose symptoms resolve within 24 hours.

When is code G45.9 used?

Used for transient cerebral ischaemic attack, unspecified. It belongs to Chapter 6 of ICD-10-CM (Diseases of the nervous system).

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.