What is OHIP billing code E400?

E400 is "After Hours Premium - Evenings, Weekends, and Holidays (50%)", an OHIP Surgical Assists code from the Ontario Schedule of Benefits (Physician Services).

How much does E400 pay?

The current OHIP fee for E400 is $0.00, effective 2026-04-01, per the Ontario Schedule of Benefits.

How do I bill E400 to OHIP?

E400 is submitted through OHIP's MCEDT claims system, either directly or via billing software. SnapBill validates E400 claims against the Schedule of Benefits rules before submission.

What codes are related to E400?

Codes related to E400 in the Schedule of Benefits include E401, E409, E412.

All codes

E400

E400 – After Hours Premium - Evenings, Weekends, and Holidays (50%)

OHIP Surgical Assists Code · Schedule of Benefits

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A premium payable to surgical assistants (E400B) or anaesthesiologists (E400C) for cases commencing during evening hours (17:00h to 24:00h) on weekdays, or during daytime and evening hours on Saturdays, Sundays, or Holidays. The premium increases the total fee (basic units plus time units) by 50%.

When to Use

Use E400B for surgical assistance services that commence between 17:00 and 24:00 on weekdays, or anytime on weekends and statutory holidays.
Apply E400C to anaesthesia services when the case start time falls within the designated evening, weekend, or holiday windows.
Use E400 in conjunction with C998C or C985C when the anaesthesiologist is called in specifically for an emergency procedure during these time blocks.

Common Pitfalls

Billing E400 based on the time the procedure ends rather than the actual start time of the case.
Failing to include the mandatory start and stop times in the medical record when billing E400 in combination with replacement service codes E005B or E005C.
Confusing E400 (50%) with E401 (75%), which is reserved exclusively for cases commencing between 00:00 and 07:00.

Billing Tips

Ensure the start time is clearly documented in the anaesthesia or surgical record to support the claim if audited against the 17:00 cutoff.
Always calculate the 50% premium based on the total fee, which must include both the basic units and the total time units for the procedure.

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Provider Fee$0.00

Surgical Assistant Fee$6.46

Anaesthetist Fee$7.98

Non-Anaesthetist Fee$7.98

Effective: April 1, 2026

Service Type

Surgical Assistant / Anaesthesia

Code Classes

Premium

E401After Hours Premium - Nights (75%)E409Physician After Hours Premium - Evenings/Weekends/Holidays (50%)E412Emergency Department Physician After Hours Premium - Evenings/Weekends/Holidays (20%)

Holidays are defined as Family Day, Good Friday, Victoria Day, Canada Day, Civic Holiday, Labour Day, Thanksgiving, New Year’s Day, Christmas Day, and Boxing Day (with specific rules for weekends).

The premium applies to the total fee, which includes both basic and time units.

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