G548 – Electrophysiological assessment of Deep Brain Stimulators
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
Electrophysiological assessment of Deep Brain Stimulators - includes measuring electrode impedance, recording EEG and EMG, rectification, averaging, frequency analysis and cross correlation. Minimum of 3 hours. Physician must be physically present throughout assessment.
When to Use
- Use G548 when performing a comprehensive electrophysiological evaluation of a DBS system that requires a minimum of 3 hours of continuous physician presence.
- Select G548 for complex programming sessions involving multi-modal data integration, such as simultaneous EEG/EMG recording and frequency analysis, which exceeds the scope of standard G547 follow-up visits.
Common Pitfalls
- Failure to explicitly document the exact start and end times in the patient chart will result in an automatic rejection or clawback during audit.
- Billing G548 for sessions lasting less than 180 minutes is a non-compliance error; the 3-hour threshold is a strict requirement for this specific fee code.
- Attempting to bill G548 in conjunction with standard office visit codes (A007) for the same encounter is generally disallowed as the procedure fee is intended to be comprehensive.
Billing Tips
- Ensure the clinical note explicitly lists the specific electrophysiological measurements performed, such as impedance, rectification, and cross-correlation, to justify the 3-hour duration.
- If the procedure involves the insertion of subtemporal needle electrodes, remember to append G417 to the claim to capture the additional procedural component.
Effective: April 1, 2025
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Procedure
Diagnostic and Therapeutic Procedures
In terms of a minimum required duration of time, the physician must record on the patient’s permanent medical record or chart the time when the insured service started and ended. If the patient’s permanent medical record or chart does not include this required information, the service is not eligible for payment.
Ready to bill this code?
SnapBill makes OHIP billing simple — auto-filled codes, validation, and batch submission.