ICD-10 G45.4
Billable / SpecificTransient global amnesia
About ICD-10-CM G45.4
ICD-10-CM code G45.4 represents Transient global amnesia. This is a billable/specific code in the Nervous System chapter (block G45). The 2026 edition of ICD-10-CM G45.4 became effective on October 1, 2025.
Type 1 Excludes
Pure excludes, these codes can never be coded together with G45.4. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- amnesia NOS (R41.3)
Medicare LCD Coverage for G45.4
Local Coverage Determinations (LCDs) from CMS MACs that list G45.4 as a covered diagnosis.
Showing top 10 of 232 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing G45.4.
1 Cigna
5 Medicare
CPT Codes Commonly Billed with G45.4
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 93892 CMS LCD: Billing and Coding: Transcranial Doppler Studies CMS LCD
- 93888 CMS LCD: Billing and Coding: Transcranial Doppler Studies CMS LCD
- 93893 CMS LCD: Billing and Coding: Transcranial Doppler Studies CMS LCD
- 93886 CMS LCD: Billing and Coding: Transcranial Doppler Studies CMS LCD
- 93897 CMS LCD: Billing and Coding: Transcranial Doppler Studies CMS LCD
- 93896 CMS LCD: Billing and Coding: Transcranial Doppler Studies CMS LCD
- 93898 CMS LCD: Billing and Coding: Transcranial Doppler Studies CMS LCD
- 93882 CMS LCD: Billing and Coding: Non-Invasive Cerebrovascular Arterial Studies CMS LCD
- 93895 CMS LCD: Billing and Coding: Non-Invasive Cerebrovascular Studies CMS LCD
Convert G45.4 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| G45.4 | 4377 | 00000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To G45.4
Other codes in section G40-G47 (Episodic and paroxysmal disorders).
ICD-10 G45.4, Billing FAQ
Is ICD-10 code G45.4 billable? +
Yes, G45.4 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What codes are Type 1 Excludes for G45.4? +
Type 1 Excludes (never code together with G45.4): amnesia NOS (R41.3)
What CPT codes are commonly billed with G45.4? +
Procedures frequently paired with G45.4 include: 93892, 93888, 93893, 93886, 93897.
What ICD-9 codes does G45.4 map to? +
Per CMS GEMs, G45.4 maps to ICD-9 codes: 4377. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on July 16, 2026.
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