What is OHIP billing code Z358?

Z358 is "Thoracic window closure", an OHIP Psychiatric code from the Ontario Schedule of Benefits (Physician Services).

How much does Z358 pay?

The current OHIP fee for Z358 is $111.20, effective 2025-04-01, per the Ontario Schedule of Benefits.

How do I bill Z358 to OHIP?

Z358 is submitted through OHIP's MCEDT claims system, either directly or via billing software. SnapBill validates Z358 claims against the Schedule of Benefits rules before submission.

What codes are related to Z358?

Codes related to Z358 in the Schedule of Benefits include Z357.

All codes

Z358

Z358 – Thoracic window closure

OHIP Psychiatric Code — RESPIRATORY SURGICAL PROCEDURES · Schedule of Benefits

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A surgical procedure for the closure of a thoracic window. As an Independent Operative Procedure (IOP), the fee includes the major pre-operative visit and post-operative care associated with the procedure. The specific elements of this surgical service, as outlined in the Surgical Preamble (), include supervising and/or preparing the patient, performing the procedure, arranging for related assessments or therapy, post-procedure monitoring until the first post-operative visit, and providing advice and information to the patient or their representative.

When to Use

Use Z358 for the definitive surgical closure of a thoracic window where the procedure is performed as an Independent Operative Procedure (IOP).
Select this code when the clinical requirement is specifically the closure of a thoracic window, distinguishing it from general thoracic debridement or other respiratory surgical procedures.

Common Pitfalls

Billing an office consultation or assessment on the same day as Z358 is a common rejection, as the IOP fee includes the major pre-operative visit.
Failing to apply the 85% payment rule for secondary procedures when Z358 is performed alongside other surgical interventions during the same operative session.
Attempting to bill separate post-operative visits within the global period, which are already included in the Z358 procedural fee.

Billing Tips

Ensure the surgical report clearly documents the closure technique to support the use of Z358 over less specific respiratory procedure codes.
If Z358 is performed after hours, ensure the claim includes the appropriate E-series premium (E409 or E410) to increase the procedural fee, provided the criteria for non-elective status are met.

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Provider Fee$111.20

Surgical Assistant Fee$75.06

Anaesthetist Fee$92.94

Non-Anaesthetist Fee$92.94

Effective: April 1, 2025

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