G554 – Ambulatory EEG monitoring - technical component
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
This is the technical component of a service that includes 12 to 24 hours of ambulatory Electroencephalography (EEG) monitoring. The fee includes EEG electrodes and other physiological parameters felt necessary to arrive at an appropriate electrographic diagnosis.
When to Use
- Use G554 when providing the technical component for 12 to 24 hours of ambulatory EEG monitoring for diagnostic purposes.
- Use this code when you are responsible for the full quality assurance process, including data acquisition and record keeping, for the ambulatory study.
Common Pitfalls
- Billing G554 in a hospital setting without applying the mandatory 13.9% reduction, which results in an automatic payment adjustment to 86.10% of the fee.
- Failing to bill G544 as a separate add-on code when additional physiological parameters like ECG or oxygen saturation are recorded, as these are not included in the G554 base fee.
Billing Tips
- Maximize your claim by appending up to three units of G544 if you are recording additional parameters like EMG or respirations during the same ambulatory session.
Effective: April 1, 2026
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Diagnostic
Diagnostic and Therapeutic Procedures
The physician must maintain documentation that describes the process by which the physician monitors quality assurance in accordance with professional standards. The physician submitting a claim for the technical component is responsible for the complete quality assurance process for all elements of the technical component of the service, including data acquisition, reporting, and record keeping.
Ready to bill this code?
SnapBill makes OHIP billing simple — auto-filled codes, validation, and batch submission.