Error report · Service, fee & diagnosis
OHIP error code AD8
Not allowed alone
What AD8 means
The Ministry of Health’s official wording for AD8 is: “Not allowed alone.”
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 AD8
This code can't be billed on its own - add the base service it must accompany, then resubmit.
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
- AC1Maximum reached-resubmit alternate Fee Schedule Code (FSC)
- AD3Not allowed with visit
- AD5Procedure allowed previously
- AD9Premium not allowed alone
- ADFCorresponding Procedure Invalid, Omitted or Paid at zero
- ADHCannot be billed together
- AH8Invalid Admission Date and/or Hospital number.
- AHFConcurrent or Supportive Care Same Period
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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.