Error report · Program-specific
OHIP error code R01
Missing Health Service Number (HSN)
What R01 means
The Ministry of Health’s official wording for R01 is: “Missing Health Service Number (HSN).”
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 R01
Add the out-of-province patient's Health Service Number (HSN) to the reciprocal claim and resubmit.
Program-specific codes come from claims routed through special programs — Reciprocal Medical Billing for out-of-province patients, WSIB, telemedicine/virtual care, and Integrated Community Health Services Centres. The fix depends on that program's own submission rules.
Related codes
- EF5ICHSC practitioner 991000 is not allowed to bill insured services
- EF7Referring physician number is required for the ICHSC fee billed
- EF8'I' service codes are exclusive to ICHSCs
- EF9Mobile site number required
- R02Invalid HSN
- R03Invalid/Missing Province Code
- R04Service Excluded from RMBS
- R05Provincial code invalid for RMBS Province code of 'ON' (Ontario) or ‘PQ’ (Quebec) and not an Outaouais claim
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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.