What is OHIP billing code E320?

E320 is "Cortical mastoidectomy", an OHIP Surgical Assists code from the Ontario Schedule of Benefits (Physician Services).

How much does E320 pay?

The current OHIP fee for E320 is $345.15, effective 2025-04-01, per the Ontario Schedule of Benefits.

How do I bill E320 to OHIP?

E320 is submitted through OHIP's MCEDT claims system, either directly or via billing software. SnapBill validates E320 claims against the Schedule of Benefits rules before submission.

What codes are related to E320?

Codes related to E320 in the Schedule of Benefits include E322, E315, E946, E959, E960, E985, E319.

All codes

E320

E320 – Cortical mastoidectomy

OHIP Surgical Assists Code — Y. Ocular and Aural Surgical Procedures · Schedule of Benefits

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Cortical mastoidectomy. A surgical procedure involving excision of the mastoid air cells. The service is listed on page of the Schedule under Ocular and Aural Surgical Procedures. The fee for the surgeon (suffix A) is a flat rate, while fees for the surgical assistant (suffix B) and anaesthetist (suffix C) are calculated using base units and time units.

When to Use

Use E320 for a primary cortical mastoidectomy where the mastoid air cells are excised without the more extensive canal wall down or radical modifications required by E322.
Use E320 when performing a mastoidectomy as a standalone procedure or in conjunction with tympanoplasty or ossiculoplasty, provided the scope does not meet the criteria for a revision (E315) or radical (E322) procedure.

Common Pitfalls

Billing E320 alongside E315 or E322 is a common error; these are distinct primary procedures and should not be claimed together on the same ear.
Failing to include the appropriate add-on codes (E946, E959, E960, E985) when these specific components are performed during the same surgical session results in significant under-billing.
Incorrectly applying E320 for revision cases; if the procedure is a revision of a previous mastoidectomy, E315 is the correct primary code.

Billing Tips

Always verify if the procedure qualifies for the add-on codes E946, E959, E960, or E985, as these are flat-rate additions that must be submitted on the same claim as E320 to be paid.
Ensure the surgical assistant (suffix B) and anaesthetist (suffix C) calculate their units based on the specific base units (6 and 10 respectively) and the tiered time unit structure defined in the Schedule.

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Provider Fee$345.15

Surgical Assistant Fee$75.06

Anaesthetist Fee$154.90

Non-Anaesthetist Fee$154.90

Effective: April 1, 2025

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