ICD-10 Code G45.4 – Transient global amnesia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G45.4 – Transient global amnesia
What it is
G45.4 identifies a sudden, temporary episode of memory loss with preserved alertness and personal identity. The condition usually resolves within 24 hours and leaves no lasting focal neurologic deficit.
Clinical signs
Typical findings include acute anterograde amnesia, repetitive questioning, and inability to form new memories during the episode. Clinical features vary; refer to documentation if the presentation is atypical or prolonged.
When to use this code
Use G45.4 when the record clearly documents transient global amnesia as the diagnosis, especially after evaluation for stroke, seizure, or other causes of acute confusion. You should code it when the provider states the episode is self-limited and consistent with TGA. Check documentation if the note only says “memory loss” or “confusion.”
Do not use for
Do not use this code for persistent amnesia, dementia, delirium, or memory loss from a clearly documented alternate cause. Do not assign it if the diagnosis is uncertain or not supported by the provider’s assessment.
Coding tip
Look for the provider’s final impression of transient global amnesia, not just symptoms described during the event.