Error report · Service, fee & diagnosis
OHIP error code AO3
Most Responsible Physician (MRP) Visit Already Paid
What AO3 means
The Ministry of Health’s official wording for AO3 is: “Most Responsible Physician (MRP) Visit Already Paid.”
This code appears on your Claims Error Report (downloaded through MCEDT). It means the claim was rejected at submission and was never adjudicated for payment — fix the issue below and resubmit the claim.
How to fix AO3
An MRP (most responsible physician) visit was already paid for this patient and date - only one is payable, so don't rebill it.
These codes relate to the fee schedule code, diagnosis code, fee amount, or service limits in the Schedule of Benefits. The fix usually starts with re-reading the code's payment rules — effective dates, age/sex limits, maximums, and combinations — for the date of service.
Related codes
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Code meaning per Ontario Ministry of Health — Error Report Rejection Conditions / Error Codes (December 2022). The suggested action is general information for Ontario physicians, not billing, legal, or tax advice — codes and rules change, so verify against the current Ministry of Health documents before relying on a claim.