Transient cerebral ischemic attacks and related syndromes (G45) ICD-10-CM
The G45 code range covers transient cerebral ischemic attacks and related syndromes with 8 ICD-10-CM diagnosis codes. 7 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the G45 Range 8 codes · 7 billable
- G45 Transient cerebral ischemic attacks and related syndromesNon-billable
- G45.0 Vertebro-basilar artery syndrome
- 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
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the G45 range.
Amaurosis Fugax
Transient complete or partial monocular blindness due to retinal ischemia. This may be caused by emboli from the CAROTID ARTERY (usually in association with CAROTID STENOSIS) and other locations that enter the central RETINAL ARTERY. (From Adams et al., Principles of Neurology, 6th ed, p245)
Amnesia, Transient Global
A syndrome characterized by a transient loss of the ability to form new memories. It primarily occurs in middle aged or elderly individuals, and episodes may last from minutes to hours. During the period of amnesia, immediate and recent memory abilities are impaired, but the level of consciousness and ability to perform other intellectual tasks are preserved. The condition is related to bilateral dysfunction of the medial portions of each TEMPORAL LOBE. Complete recovery normally occurs, and recurrences are unusual. (From Adams et al., Principles of Neurology, 6th ed, pp429-30)
Carotid Artery Syndrome
A syndrome caused by stenosis or occlusion of a carotid artery due to atherosclerotic plaque. Symptoms are particular to the cerebral hemisphere supplied by the given carotid artery.
Transient Ischemic Attack
A brief attack (from a few minutes to an hour) of cerebral dysfunction of vascular origin, with no persistent neurological deficit.
Vertebrobasilar Artery Syndrome
Temporary occlusion of the vertebral artery caused by rotation of the neck leading to symptoms of dizziness and vertigo, secondary to bone spurs or ligament impingement.
About the G45 Code Range
Transient cerebral ischemic attacks involve a temporary reduction in blood flow to the brain. This category also includes related syndromes.
The artery involved separates several subdivisions: G45.0 names the vertebro-basilar arteries, G45.1 the carotid artery, and G45.2 multiple or bilateral arteries leading to the brain. Other subdivisions name amaurosis fugax (G45.3) and transient global amnesia, or temporary memory loss (G45.4). G45.8 identifies other attacks and related syndromes; G45.9 identifies an unspecified attack.
Questions About This Page
How many billable codes are in the G45 range?
Of the 8 codes in this range, 7 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the G45 range classify?
The range classifies transient cerebral ischemic attacks and related syndromes. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
