G543 – Sleep-deprived/induced EEG - professional component
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
A sleep-deprived/induced EEG is an EEG recording (with or without video monitoring) performed after an overnight period of sleep deprivation of greater than 4 hours; or the administration of a sedative/hypnotic agent prior to the EEG recording for the purposes of sleep induction, and must include all of the following: a. at least 60 minutes of EEG recording time; b. a minimum of 16 channels of EEG; and c. recordings of at least two physiological parameters.
When to Use
- Use G543 when a patient undergoes an EEG following at least 4 hours of documented sleep deprivation to increase the yield of epileptiform discharges.
- Use G543 when a sedative or hypnotic agent is administered specifically to induce sleep during the EEG procedure to capture sleep-related activity.
- Use G543 instead of G415 or G418 when the recording duration meets the 60-minute threshold and includes at least two physiological parameters.
Common Pitfalls
- Billing G543 when the recording duration is less than 60 minutes, which triggers an automatic payment reduction to the lower-valued G415 or G418 fee.
- Attempting to bill G543 in conjunction with any sleep study codes (e.g., J898, J899), which will result in a rejection as they are mutually exclusive.
- Failing to document the specific physiological parameters recorded, which is a mandatory requirement for audit compliance under G543.
Billing Tips
- Ensure your technical report explicitly states the total recording time and the specific physiological parameters monitored to satisfy the documentation requirements for G543.
- Verify that no other EEG codes (G415, G418, G496) are submitted for the same patient on the same day, as the Ministry enforces a strict one-per-day limit.
Effective: April 1, 2025
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Diagnostic
Diagnostic and Therapeutic Procedures
A sleep-deprived/induced EEG is eligible for payment as G543 only when the following is documented in the medical record: - At least 60 minutes of EEG recording time. - A minimum of 16 channels of EEG. - Recordings of at least two physiological parameters.
1. The amount payable for a sleep-deprived/induced EEG, or an EEG with time-locked video recording that does not meet the above requirements will be reduced to that for a routine EEG fees (i.e. G414 and G415/G418).
2. G414 is not eligible for payment with G541.
3. Only one of G415, G418, G543 or G496 are eligible for payment per day.
4. EEG services (i.e. G414, G415, G418, G496, G541, G543, G540, G545, G542, G546, G554, G555, or G544) are not eligible for payment with any overnight or daytime sleep study (i.e. J898, J899, J990, J896, J897, J895, J890, J889, J893 or J894).
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