G540 – Prolonged EEG monitoring - technical component
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
Videotape recording of clinical signs in association with spontaneous EEG. This fee code represents the technical component of the service. Unit means ¼ hour or major part thereof. See General Preamble for definitions and time-keeping requirements. Payable at nil if claimed with any baseline EEG.
When to Use
- Use G540 for the technical component of prolonged EEG monitoring when capturing clinical signs alongside spontaneous EEG activity.
- Use this code specifically for the technical setup and recording phase when the service does not qualify as a standard baseline EEG.
Common Pitfalls
- Submitting G540 alongside any baseline EEG code will result in an automatic rejection or payment at nil.
- Exceeding the 12-unit maximum per service date will trigger a rejection for the excess units.
- Failing to document exact start and end times in the chart is a primary cause for recovery during MOH audits.
Billing Tips
- Ensure you are billing the technical component at 86.10% of the listed fee if the service is performed within a hospital setting.
- Clearly distinguish G540 from G545 in your records, as G545 carries different unit limits and service constraints.
Effective: April 1, 2026
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Diagnostic
Diagnostic and Therapeutic Procedures
When a service is based upon the number of “units” of service rendered, the physician must record on the patient's permanent medical record or chart the time when the insured service started and ended.
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. The physician must be able to demonstrate the above upon request by the MOH.
The physician maintains documentation that describes the process by which the physician monitors quality assurance in accordance with professional standards.
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