How do I fix OHIP error code SN?

If the procedures were done under one anaesthetic, claim one anaesthetic with the basic units of the major procedure and the total time units. If there were separate surgeries, send the anaesthetic records or operative reports showing each surgery and its times. If you believe the payment is wrong, send a Remittance Advice Inquiry (RAI) through eSubmit, or on form 0918-84, within 7 months of the RA date, with supporting details.

When shouldn't I resubmit a SN claim?

All the procedures were done under one anaesthetic. The claim is already on your Remittance Advice. Use an RAI, not a new claim.

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Error code

SN — Multiple surgical anaesthesia - document separate surgeries (same day/patient)

Q: What does OHIP error code SN mean?

SN means more than one anaesthetic was claimed for the same patient on the same day. Documentation of separate surgeries is needed.

Separate surgeries not shown

More than one anaesthetic was claimed for the same patient on the same day without documentation of separate surgeries.

What to do: For one anaesthetic, claim the major procedure's basic units plus total time; for separate surgeries, send the anaesthetic records.

Code: SN
Description: Multiple surgical anaesthesia - document separate surgeries (same day/patient)

Explanation

Updated October 26, 2026

SN means more than one anaesthetic was claimed for the same patient on the same day. Documentation of separate surgeries is needed.

What it means

Code SN means OHIP needs documentation of separate surgeries before it pays more than one surgical anaesthetic for the same patient on the same day.

When multiple or bilateral procedures are done during the same anaesthetic, the anaesthesia basic units are those of the major procedure only, plus time units (GP92–GP93). Separate basic units are only paid when there were separate surgeries.

Common causes

Two anaesthesia claims sent for procedures done under one anaesthetic
Two separate surgeries on the same day, claimed without supporting documentation

How to fix it

If the procedures were done under one anaesthetic, claim one anaesthetic with the basic units of the major procedure and the total time units.
If there were separate surgeries, send the anaesthetic records or operative reports showing each surgery and its times. If you believe the payment is wrong, send a Remittance Advice Inquiry (RAI) through eSubmit, or on form 0918-84, within 7 months of the RA date, with supporting details.

Don't resubmit if

All the procedures were done under one anaesthetic.
The claim is already on your Remittance Advice. Use an RAI, not a new claim.

How APEX handles it

APEX reads your error reports and remittance advice from MCEDT and lists claims rejected with this code in its Correction Centre for you to correct and resubmit. See how APEX works · Pricing

Related codes: S3