ICD-10-CM
ICD-10 code for Transient ischemic attack: G45.9
The CDC title for "Transient ischemic attack" is G45 (Transient cerebral ischemic attacks and related syndromes), a header that is not billable. When nothing more specific is documented, the billable code is G45.9, Transient cerebral ischemic attack, unspecified.
Source: CDC ICD-10-CM FY2027 order file dated June 16, 2026. Publisher page
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Codes under G45, then other CDC titles that name transient cerebral ischemic attack
A header groups codes and is not billed. A billable code is one you can report.
- G45Transient cerebral ischemic attacks and related syndromesHeader
- G45.0Vertebro-basilar artery syndromeBillable
- G45.1Carotid artery syndrome (hemispheric)Billable
- G45.2Multiple and bilateral precerebral artery syndromesBillable
- G45.3Amaurosis fugaxBillable
- G45.4Transient global amnesiaBillable
- G45.8Other transient cerebral ischemic attacks and related syndromesBillable
- G45.9Transient cerebral ischemic attack, unspecifiedBillable
Excludes1
Excludes1 means these codes are not reported together.
From G45. A note on a category applies to every code under it.
Related conditions
Related pages
- G45.9 code detailsNotes, nearby codes, CMS-HCC group
- Category G45Every code under it
- Chapter 6Diseases of the nervous system
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Transient ischemic attack?
The CDC title for "Transient ischemic attack" is G45 (Transient cerebral ischemic attacks and related syndromes), a header that is not billable. When nothing more specific is documented, the billable code is G45.9, Transient cerebral ischemic attack, unspecified.
Is G45.9 billable?
Yes. G45.9 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to G45.9?
The CDC tabular list gives 2 Excludes1 notes (not coded together) for G45.9 and the categories above it. They are listed on this page.
What chapter is G45.9 in?
Chapter 6. Diseases of the nervous system.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.