Error report · Service, fee & diagnosis
OHIP error code AMS
Multiple Procedures
What AMS means
The Ministry of Health’s official wording for AMS is: “Multiple Procedures.”
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 AMS
Multiple procedures were billed - confirm each is separately payable (reductions may apply) and resubmit with the correct codes and units.
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
- 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
- AM1Service Limit Exceeded
- AO2Previous Obstetrical Service
- AO3Most Responsible Physician (MRP) Visit Already Paid
- ASPNot Allowed with Surgical Procedure
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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.