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G417
G417 – Inserting subtemporal needle electrodes
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
When to Use
- Use G417 when performing needle electrode insertion specifically for subtemporal placement during a standard EEG or specialized electrophysiological assessment like G266.
- Apply this code when the clinical protocol requires invasive subtemporal monitoring to capture activity not visible on standard scalp electrodes during a G548 assessment.
Common Pitfalls
- Billing G417 as a standalone procedure will result in automatic rejection, as it must be linked to a primary electrophysiological assessment code on the same claim.
- Attempting to bill G417 multiple times for a single session is a common audit trigger; ensure the documentation supports the specific number of insertions if claiming more than once.
Billing Tips
- Always ensure the primary procedure code (e.g., G266 or G548) is listed on the same claim to satisfy the 'add-on' requirement for G417.
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