Error report · Service, fee & diagnosis
OHIP error code A1A
Outside Service Period
What A1A means
The Ministry of Health’s official wording for A1A is: “Outside Service Period.”
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 A1A
This service falls outside the time window the fee code allows (for example a repeat assessment billed too soon). Check the timing rules in the Schedule of Benefits and bill the appropriate code, or fix the service date if it was entered wrong.
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
- A2AOutside of Age Limit - Patient is underage or overage for this service code
- A2BWrong Sex for Service - This service is not normally performed for this sex. Please check your records.
- A3ENo such service code for date of service
- A3FNo fee exists for this service code on this date of service
- A3GFee Billed Low
- A3HMaximum Number Services per the Fee Schedule Master (FSM)
- A3IX-Ray Code - Maximum Number Services per the Fee Schedule Master (FSM)
- A3LOther New Patient Fee Already Paid
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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.