G45.4
BillableTransient global amnesia
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
Transient global amnesia is a sudden, temporary loss of memory that typically lasts a few hours, during which a person cannot form new memories or recall recent events, though they remain alert and aware. The condition resolves completely on its own without any permanent brain damage.
Coding Tips
- •This code is used for the acute episode of transient global amnesia; document the onset time and duration of the amnesia episode for clinical clarity
- •Ensure this diagnosis is not confused with other causes of amnesia (such as head injury, stroke, or dementia); transient global amnesia is specifically characterized by its temporary nature and complete resolution
Excludes 1 — Do NOT code together
- amnesia NOS (R41.3)
Code Hierarchy
└G45Transient cerebral ischemic attacks and related syndromes└G45.4Transient global amnesia
└G45.4Transient global amnesia