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 2026, 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)
Subclavian Steal Syndrome
A clinically significant reduction in blood supply to the BRAIN STEM and CEREBELLUM (i.e., VERTEBROBASILAR INSUFFICIENCY) resulting from reversal of blood flow through the VERTEBRAL ARTERY from occlusion or stenosis of the proximal subclavian or brachiocephalic artery. Common symptoms include VERTIGO; SYNCOPE; and INTERMITTENT CLAUDICATION of the involved upper extremity. Subclavian steal may also occur in asymptomatic individuals. (From J Cardiovasc Surg 1994;35(1):11-4; Acta Neurol Scand 1994;90(3):174-8)
About the G45 Code Range
ICD-10 code group G45 covers transient cerebral ischemic attacks and related syndromes, which are brief episodes of reduced blood flow to the brain causing temporary neurological symptoms. These codes are used to classify conditions involving sudden but short-lived brain ischemia without permanent damage.
The detailed codes within the G45 section specify different types of transient ischemic events. For example, G45.0 represents vertebro-basilar artery syndrome, encompassing terms like vertebrobasilar artery syndrome and acute cerebral ischemia. G45.1 identifies carotid artery syndrome (hemispheric), also known as carotid territory transient ischemic attack. G45.3 relates to amaurosis fugax, a temporary vision loss often linked to carotid insufficiency. G45.4 captures transient global amnesia, which involves temporary loss of memory. Other codes like G45.8 cover less common syndromes such as subclavian steal syndrome. The unspecified code G45.9 is used when the transient ischemic attack type is not clearly documented. Medical coders rely on these to accurately classify and document transient cerebral ischemic events based on symptoms and affected arteries.
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, 2025 through September 30, 2026. 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 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
