How do I fix OHIP error code 36?

Check with your group and any covering physicians whether someone else billed the service for this patient on this date. If the other claim is correct, there is nothing to fix. If the service was billed under the wrong physician's number, have that claim corrected first. Changes to a paid claim go through an RAI, not a new claim. If you provided the service and believe you should have been paid, send a Remittance Advice Inquiry (RAI) through eSubmit, or on form 0918-84, within 7 months of the RA date, with your documentation.

When shouldn't I resubmit a 36 claim?

Another provider legitimately billed and was paid for the service. You haven't found out who billed it. Sending the claim again will usually just return 36 again. You want to dispute the 36. Use an RAI, not a new claim.

< Error codes

Error code

36 — Service already claimed by another practitioner, group or lab

Q: What does OHIP error code 36 mean?

OHIP didn't pay this claim because its records show another physician, group or lab already billed the same service. Find out who before acting.

Billed by another physician

OHIP's records show another physician, group or lab already billed the same service for this patient, so this claim wasn't paid.

What to do: Ask your group and covering physicians who billed the service for this patient on this date before acting.

Code: 36
Description: Service already claimed by another practitioner, group or lab

Explanation

Updated October 26, 2026

OHIP didn't pay this claim because its records show another physician, group or lab already billed the same service. Find out who before acting.

What it means

Code 36 is a Remittance Advice (RA) explanatory code. The Ministry's wording is that OHIP records show the service has been rendered by another practitioner, group or lab. The claim is not paid.

It is the companion of code 35. Code 35 means you already billed the same service yourself. Code 36 means someone else did, for the same patient and service.

Often the other claim is legitimate, for example when a colleague saw the patient, or a lab billed a test that was also claimed from the office. Sometimes it is a billing mix-up, such as a visit billed under the wrong physician's number.

Common causes

Another physician in your group billed the same visit or service for the patient
The service was billed under the wrong billing number, so it shows as another practitioner's claim
A lab claimed a test that was also billed by the physician
A service that can only be paid once per patient was already paid to another provider

How to fix it

Check with your group and any covering physicians whether someone else billed the service for this patient on this date.
If the other claim is correct, there is nothing to fix.
If the service was billed under the wrong physician's number, have that claim corrected first. Changes to a paid claim go through an RAI, not a new claim.
If you provided the service and believe you should have been paid, send a Remittance Advice Inquiry (RAI) through eSubmit, or on form 0918-84, within 7 months of the RA date, with your documentation.

Don't resubmit if

Another provider legitimately billed and was paid for the service.
You haven't found out who billed it. Sending the claim again will usually just return 36 again.
You want to dispute the 36. Use an RAI, not a new claim.

How APEX handles it

APEX treats 36 as a code that can't be corrected and keeps it out of the Correction Centre queue, so it never resubmits these claims. The line stays in your claims with its billed and paid amounts so you can follow it up. See how APEX works · Pricing

Related codes: 35, 32, 55, 57