`G45.9` Transient cerebral ischemic attack, unspecified

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applicable to

Spasm of cerebral artery
TIA
Transient cerebral ischemia NOS

Applies from G45 Transient cerebral ischemic attacks and related syndromes

Excludes1 (never code together)

neonatal cerebral ischemia (P91.0)
transient retinal artery occlusion (H34.0-)

MS-DRG index

Defines the logic of DRG(s) 061-063 in MDC 01.

Approximate ICD-9-CM (GEMs)

435.9 Unspecified transient cerebral ischemia (approximate)

Code annotations containing back-references to G45.9

Back-references to G45.9

Type 2 Excludes: I69.322 Dysarthria following cerebral infarction ("transient ischemic attack (TIA) (G45.9)")
Type 2 Excludes: I69.351 Hemiplegia and hemiparesis following cerebral infarction affecting right dominant side ("transient ischemic attack (TIA) (G45.9)")
Type 2 Excludes: I73 Other peripheral vascular diseases ("spasm of cerebral artery (G45.9)")
Type 1 Excludes: R29.5 Transient paralysis ("transient ischemic attack (G45.9)")

Back-references to G45

Type 2 Excludes: I63.9 Cerebral infarction, unspecified ("transient cerebral ischemic attacks and related syndromes (G45.-)")
Type 1 Excludes: I65 Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction ("insufficiency, NOS, of precerebral artery (G45.-)")

Diagnosis Index entries for G45.9

Angiospasm (peripheral) (traumatic) (vessel) › cerebral
Attack, attacks › transient ischemic (TIA)
Claudication (intermittent) › cerebral (artery)
Disease, diseased › angiospastic › cerebral
Ischemia, ischemic › cerebral (chronic) (generalized) › intermittent
Ischemia, ischemic › cerebral (chronic) (generalized) › transient
Spasm (s), spastic, spasticity › artery › cerebral
Spasm (s), spastic, spasticity › cerebral (arteries) (vascular)

Nearby codes

G45.1 Carotid artery syndrome (hemispheric)
G45.2 Multiple and bilateral precerebral artery syndromes
G45.3 Amaurosis fugax
G45.4 Transient global amnesia
G45.8 Other transient cerebral ischemic attacks and related syndromes
G45.9 Transient cerebral ischemic attack, unspecified (this code)