What are the billing rules for G400A?

These are team fees: claim the daily formula as if there were one physician-in-charge, even if the physician-in-charge changes during treatment (J30). When claiming critical, ventilatory, comprehensive or neonatal intensive care fees, no other critical care codes are payable to the same physician(s) (J30). Not payable for stabilized patients or patients in the unit only for ECG monitoring or observation, except when the patient is on a ventilator; bill consultations, assessments and procedures instead (J30, J31).

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Billing code

G400A — Critical care (intensive care area) – physician-in-charge – 1st day

Q: What is OHIP billing code G400A?

Critical care per diem for the physician-in-charge of a critically ill patient in an intensive care area, 1st day.

ICU critical care, day 1

Bill G400 as the physician-in-charge of a critically ill patient in an intensive care area, for the first day.

Watch for: Not payable for stabilized patients or those only being monitored, unless ventilated; bill visits and procedures instead.

Provider	Specialist	Assistant	Anaesthetist	Non-anaesthetist
$223.10	$0.00	$0.00	$0.00	$0.00

Code: G400A
Description: Critical care (intensive care area) – physician-in-charge – 1st day
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

Critical care per diem for the physician-in-charge of a critically ill patient in an intensive care area, 1st day.

What it covers

G400 is the critical care fee for the physician-in-charge, 1st day (J31). It is marked #, so premises and equipment are hospital funded (J1).

Critical care is all aspects of care of a critically ill patient in an intensive care area, excluding ventilatory support. It includes the initial consultation and assessment, emergency resuscitation, IV lines, cutdowns, intraosseous infusion, arterial, CVP or urinary catheters, nasogastric intubation, lab tests, oximetry and ICP monitoring interpretation (not insertion of the ICP device) (J31).

Billing rules

These are team fees: claim the daily formula as if there were one physician-in-charge, even if the physician-in-charge changes during treatment (J30).
When claiming critical, ventilatory, comprehensive or neonatal intensive care fees, no other critical care codes are payable to the same physician(s) (J30).
Not payable for stabilized patients or patients in the unit only for ECG monitoring or observation, except when the patient is on a ventilator; bill consultations, assessments and procedures instead (J30, J31).
Bill G400 for the first day, G401 for days 2 to 30 and G402 from day 31 (J31).
If the patient is transferred from comprehensive care to critical care, the transfer day counts as the 2nd day of critical care (J31).
If the patient was discharged from the unit more than 48 hours earlier and is re-admitted, the 1st-day rate applies again on the day of re-admission (J30).
Life-threatening (G521/G522/G523) and other critical care (G395/G391) aren't payable to a physician paid a per diem for the same patient that day (J27, J28). C101 ICU/CCU premium is not payable when team fees are claimed (GP103).
After critical care stops, the usual consultation, assessment and procedure fees apply (J30).

Related codes: G401, G402, G405, G557, G521, G395

Source: Schedule of Benefits (July 1, 2026), Diagnostic and Therapeutic Procedures, Critical Care, page J31; per diem rules J30.

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