G45.9
BillableTransient cerebral ischemic attack, unspecified
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
A temporary interruption of blood flow to the brain that causes stroke-like symptoms but resolves completely within 24 hours, with no permanent brain damage. This code is used when the specific type or location of the transient ischemic attack (TIA) is not documented.
Coding Tips
- •Use G45.9 only when the documentation does not specify the type of TIA (such as vertebrobasilar, carotid, or cerebral); if a specific type is documented, use the more specific G45.0-G45.8 codes instead
- •Ensure the clinical record confirms the symptoms resolved completely and imaging ruled out acute stroke; TIAs are often called 'warning strokes' and warrant documentation of follow-up care and risk factor management
Code Hierarchy
└G45Transient cerebral ischemic attacks and related syndromes└G45.9Transient cerebral ischemic attack, unspecified
└G45.9Transient cerebral ischemic attack, unspecified