What are the billing rules for G543A?

A sleep-deprived/induced EEG or video EEG that doesn't meet its requirements is paid as a routine EEG (G414 and G415/G418) (J84). Only one of G415, G418, G543 or G496 is payable per day (J84). No EEG service is payable with an overnight or daytime sleep study (J898, J899, J990, J896, J897, J895, J890, J889, J893 or J894) (J84).

What is G543A often billed with?

G541 technical component (J84). G544 polygraphic recording of extra parameters, technical, per item (max 3) (J85).

Why is G543A rejected?

ADH: OHIP describes this as 'Cannot be billed together': only one of G415, G418, G543 or G496 is payable per day (J84).

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Billing code

G543A — Sleep-deprived/induced Eeg - Professional Component

Q: What is OHIP billing code G543A?

Professional component of a sleep-deprived or sleep-induced EEG of at least 60 minutes with 16+ channels.

Sleep-deprived EEG interpretation

Bill G543 for interpreting a sleep-deprived or induced EEG of at least 60 minutes with 16 or more channels.

Watch for: Only one of G415, G418, G543 or G496 per day; a study missing the requirements pays as a routine EEG.

Provider	Specialist	Assistant	Anaesthetist	Non-anaesthetist
$120.00	$0.00	$0.00	$0.00	$0.00

Code: G543A
Description: Sleep-deprived/induced Eeg - Professional Component
FHO+ basket: Not in the FHO+ base rate basket (Schedule 2 or 2B).
Effective date: Apr 1, 2025
Termination date: No end date

Explanation

Updated October 26, 2026

Professional component of a sleep-deprived or sleep-induced EEG of at least 60 minutes with 16+ channels.

What it covers

A sleep-deprived/induced EEG follows more than 4 hours of overnight sleep deprivation, or a sedative/hypnotic given to induce sleep. It must include at least 60 minutes of recording, at least 16 EEG channels and recordings of at least two physiological parameters (J84).

It may be done with or without video monitoring. The technical component is G541 (J84).

Billing rules

A sleep-deprived/induced EEG or video EEG that doesn't meet its requirements is paid as a routine EEG (G414 and G415/G418) (J84).
Only one of G415, G418, G543 or G496 is payable per day (J84).
No EEG service is payable with an overnight or daytime sleep study (J898, J899, J990, J896, J897, J895, J890, J889, J893 or J894) (J84).
You must personally interpret the results. Supervision and monitoring may be delegated to another physician (J1).

Often billed with

G541 technical component (J84).
G544 polygraphic recording of extra parameters, technical, per item (max 3) (J85).

Common rejections

ADH: OHIP describes this as 'Cannot be billed together': only one of G415, G418, G543 or G496 is payable per day (J84).

Related codes: G541, G496, G415, G418, G544

Source: Schedule of Benefits (July 1, 2026), Diagnostic and Therapeutic Procedures, Neurology, Electroencephalography, page J84.

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