ICD-10-CM 2027
ICD-10 code for transient global amnesia
From the official ICD-10-CM alphabetic index entry “Amnesia › transient global”. Page updated September 29, 2026.
About coding transient global amnesia
The ICD-10-CM code for transient global amnesia is G45.4 (Transient global amnesia).
Within G45 (transient cerebral ischemic attacks and related syndromes), G45.4 is specifically for transient global amnesia. Related codes cover Vertebro-basilar artery syndrome (G45.0), carotid artery syndrome (hemispheric) (G45.1), multiple and bilateral precerebral artery syndromes (G45.2), Amaurosis fugax (G45.3), other transient cerebral ischemic attacks and related syndromes (G45.8) and transient cerebral ischemic attack, unspecified (G45.9).
Don't report G45.4 together with the conditions in its Excludes1 note: amnesia NOS (R41.3).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Don't confuse with (Excludes1 for G45.4)
- amnesia NOS (R41.3)
Common questions about transient global amnesia ICD-10 codes
What is the ICD-10 code for transient global amnesia?
- G45.4 — Transient global amnesia.
Is G45.4 billable?
- Yes. G45.4 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G45.4 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G45.4 as a principal diagnosis.
Is G45.4 a CC or MCC?
- No. G45.4 is neither a CC nor an MCC under MS-DRG v44.0.