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ICD-10-CM 2027 diagnosis code

G45Transient cerebral ischemic attacks and related syndromes

Not billable — use a more specific code

G45 is a header code, so it can't be reported by itself. Choose one of the 7 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About G45

G45 is the ICD-10-CM diagnosis code for transient cerebral ischemic attacks and related syndromes. It belongs to block G40-G47 (episodic and paroxysmal disorders) and chapter 6 (diseases of the nervous system). It is a header code, so it can't be reported by itself; one of its 7 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: G45.0 (syndrome), G45.1 ((hemispheric)), G45.2 (syndromes), G45.3 (fugax), G45.4 (amnesia), G45.8 (syndromes) and G45.9 (unspecified).

Don't report G45 together with the conditions in its Excludes1 note: neonatal cerebral ischemia (P91.0) and transient retinal artery occlusion (H34.0-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under G45

Coding notes

Excludes1Not coded here — never report together with this code
  • neonatal cerebral ischemia (P91.0)
  • transient retinal artery occlusion (H34.0-)

Notes that apply from higher levels

Instructions written at a parent level also apply to G45.

Broader instructions also apply from Chapter 6: Diseases of the nervous system.

Codes whose notes reference G45

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about G45

Is G45 billable?

No. G45 is a header code. Report one of its more specific subcodes instead.