G45.9 ICD-10-CA code: Transient cerebral ischaemic attack, unspecified
G45.9 is the ICD-10-CA code for “Transient cerebral ischaemic attack, unspecified” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
G45.9Transient cerebral ischaemic attack, unspecified
Short description: Transient cerebral ischaemic attack NOS
ICD-10-CA · Canada · Also written G459
Index terms
Entries in CIHI’s alphabetical index that lead to G45.9. Searching the index by the condition the note names is how coders reach this code.
- Angiospasm, cerebral
- Vasospasm (artery), cerebral
- Attack, transient ischemic (TIA)
- Claudication, intermittent, cerebral (artery)
- Disease, diseased, angiospastic, cerebral (artery)
- Spasm(s), spastic, spasticity, artery NEC, cerebral
- Attack, transient ischemic (TIA), with diabetes mellitus
- Spasm(s), spastic, spasticity, cerebral (arteries) (vascular)
- Claudication, intermittent, cerebral (artery), with diabetes mellitus
- Disease, diseased, angiospastic, cerebral (artery), with diabetes mellitus
- Ischemia, ischemic, cerebral (chronic) (generalized), intermittent, transient
- Spasm(s), spastic, spasticity, artery NEC, cerebral, with (in) diabetes mellitus
- Ischemia, ischemic, cerebral (chronic) (generalized), intermittent, transient, with diabetes mellitus
Notes for G45.9
As CIHI prints them, with any note G45.9 takes from the headings above it.
Includes
- Spasm of cerebral arteryTransient cerebral ischaemia NOS
Use additional code
Add a code for this detail when the note documents it.
- Use additional code from category (E10-E14) with fourth and fifth characters .52 to classify any associated diabetes mellitus.
Excludes
Conditions classified elsewhere.
- Neonatal cerebral ischaemia (P91.0)From G45 Transient cerebral ischaemic attacks and related syndromes
- Certain:• conditions originating in the perinatal period (P00-P96)• infectious and parasitic diseases (A00-B99)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)From Chapter 6: Diseases of the nervous system (G00-G99)
Where G45.9 sits
- 1ChapterChapter 6: Diseases of the nervous system (G00-G99)
- 2Block G40-G47Episodic and paroxysmal disorders
- 3Category G45Transient cerebral ischaemic attacks and related syndromes
- 4Valid code G45.9Transient cerebral ischaemic attack, unspecified
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does ICD-10-CA code G45.9 mean?
G45.9 is the ICD-10-CA code for “Transient cerebral ischaemic attack, unspecified” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is G45.9 in ICD-10-CA?
G45.9 sits under G45 Transient cerebral ischaemic attacks and related syndromes, within G40-G47 Episodic and paroxysmal disorders, within Chapter 6: Diseases of the nervous system (G00-G99).
What coding notes apply to G45.9?
ICD-10-CA lists Includes, Use additional code, Excludes notes for G45.9, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.