G373 – Intramuscular, subcutaneous or intradermal injection - sole reason (first injection)
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
An intramuscular, subcutaneous, or intradermal injection when this procedure is the sole reason for the patient's visit. This fee code is applicable to the first injection administered. For any additional injections performed during the same encounter, use G372. This service includes interpretation.
When to Use
- Use G373 when a patient presents specifically for a scheduled injection, such as a B12 or hormone replacement, where no other assessment or counseling occurs.
- Use G373 for the first injection of a series, and append G372 if a second, distinct injection is administered during the same visit.
Common Pitfalls
- Billing G373 alongside a K-code (e.g., K013, K033) will trigger an automatic rejection as the injection is considered part of the counseling service.
- Attempting to bill G373 for patients in a nursing home or home for the aged will result in a rejection if W010 has already been billed for that month.
- Submitting G373 for vitamin injections intended for weight loss is an audit risk, as these are explicitly excluded from OHIP coverage.
Billing Tips
- If the patient requires a second injection, ensure you bill G373 as the primary procedure and G372 as the secondary procedure to maximize the encounter value.
- If you are called to the office for an urgent, non-elective injection, ensure you append the appropriate Special Visit Premium to G373 to reflect the travel and urgency.
Effective: April 1, 2026
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Procedure
Diagnostic and Therapeutic Procedures
This service includes interpretation.
This service is not insured for vitamin injections when rendered for the purpose of facilitating weight loss.
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