G45

Non-Billable
ChapterG00–G99
Rankcategory
Official Description

Transient cerebral ischemic attacks and related syndromes

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 6: Diseases of the Nervous System (G00-G99).

CH6 Parent Instructions

Excludes2(Not included here)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Instructional Notes

Excludes1(Not coded here)
  • neonatal cerebral ischemia (P91.0)
  • transient retinal artery occlusion (H34.0-)

Clinical Hierarchy

CH6Diseases of the nervous system (G00-G99)
G40-G47Episodic and paroxysmal disorders (G40-G47)
G45Transient cerebral ischemic attacks and related syndromes
G45.0Vertebro-basilar artery syndrome
G45.1Carotid artery syndrome (hemispheric)
G45.2Multiple and bilateral precerebral artery syndromes
G45.3Amaurosis fugax
G45.4Transient global amnesia
G45.8Other transient cerebral ischemic attacks and related syndromes
G45.9Transient cerebral ischemic attack, unspecified

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to G45:

chapterCH6
Diseases of the nervous system (G00-G99)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to G45. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

25 raw paths
Amaurosis (acquired) (congenital)1 unique routes
fugax→G45
Amnesia1 unique routes
transient global→G45
Angiospasm (peripheral) (traumatic) (vessel)1 unique routes
cerebral→G45
Attack, attacks2 unique routes
transient ischemic (TIA)→G45(2 variants)
specified NEC→G45
Claudication (intermittent)1 unique routes
cerebral (artery)→G45
Disease, diseased1 unique routes
angiospastic
cerebral→G45
Insufficiency, insufficient5 unique routes
arterial(4 variants)
basilar→G45
carotid (hemispheric)→G45
precerebral (multiple) (bilateral)→G45
vertebral→G45
cerebrovascular (acute)
with transient focal neurological signs and symptoms→G45
Ischemia, ischemic3 unique routes
cerebral (chronic) (generalized)(3 variants)
intermittent→G45
recurrent focal→G45
transient→G45
Spasm (s), spastic, spasticity2 unique routes
artery
cerebral→G45
cerebral (arteries) (vascular)→G45
Syndrome8 unique routes
basilar artery→G45
carotid
artery (hemispheric) (internal)→G45
precerebral artery (multiple) (bilateral)→G45
steal
subclavian→G45
subclavian steal→G45
vertebral(2 variants)
artery→G45
steal→G45
vertebro-basilar artery→G45

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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