G845 – Measles, Mumps, Rubella (MMR)
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
G845 is an add-on code for the administration of the Measles, Mumps, and Rubella (MMR) vaccine. The '+' symbol on the source page indicates it is billed in addition to a visit/assessment. A note on specifies that if the immunization is the sole reason for the visit, fee code G700 should be added (payable once per patient per day). This procedure is eligible for delegation to a physician's employee, such as a nurse, under the conditions specified in the General Preamble (, ). This service is also exempt from same-day billing restrictions with counselling services ().
When to Use
- Use G845 when administering the MMR vaccine during a scheduled office visit where an assessment (e.g., A007) is also performed.
- Use G845 in combination with G700 when a patient attends the office solely for the MMR immunization and no other assessment or consultation is billed.
Common Pitfalls
- Billing G700 alongside an assessment code (e.g., A007 or K030) will result in a rejection, as G700 is only payable when the procedure is the sole reason for the visit.
- Attempting to bill G845 for the vaccine supply itself; this code covers the administration only, and the vaccine product is typically provided by the Ministry of Health.
Billing Tips
- Because G845 is exempt from GP58, you can successfully bill it on the same day as a counselling code (e.g., K013) without the immunization being denied.
Effective: April 1, 2026
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Procedure
Diagnostic and Therapeutic Procedures, Delegated Procedure
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