2026 ICD-10-CM Diagnosis Code G45.4Transient global amnesia
ICD-10-CM Codes›G00–G99›G40-G47›G45
- Billable — Valid for Submission
- Chronic Condition
G45.4 is a billable ICD-10-CM diagnosis code for transient global amnesia. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as anterograde amnesia. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Transient cerebral ischemia.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Anterograde amnesia
- Retrograde amnesia
- Temporary loss of memory
- Transient global amnesia
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Type 1 Excludes
- amnesia NOS R41.3
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.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- transient global - G45.4
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Amnesia
- transient global
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Retrograde Amnesia
the loss of access to memories that were previously encoded; this disorder is most commonly preceded by trauma, including physical brain injury, stroke, or seizure, but may also be psychogenic in origin. memory loss may be temporary or permanent, but the ability to encode new memories or skills is not generally affected.
Patient EducationClinical
Memory
Every day, you have different experiences and you learn new things. Your brain cannot store all of that information, so it has to decide what is worth remembering. Memory is the process of storing and then remembering this information. There are different types of memory. Short-term memory stores information for a few seconds or minutes.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert G45.4 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About G45.4Overview
Is G45.4 (Transient cerebral ischemic attacks and related syndromes) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report transient global amnesia on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What is the ICD-9 equivalent of G45.4?
Under the General Equivalence Mappings, transient global amnesia converts to ICD-9-CM 437.7 (transient global amnesia). The mapping is a direct match.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
