G590 – Influenza agent
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
This service covers the administration of the influenza agent via immunization. The '+' symbol in the Schedule on page indicates it is typically an add-on to another service, such as an assessment. If the immunization is the sole reason for the visit, it must be claimed with add-on code G700. Note that G590 is a delegable procedure under the rules outlined in and . It is also a component of the Monthly Management fee for nursing home patients (W010) and is not payable separately in that context. The service is eligible for payment on the same day as counselling services.
When to Use
- Use G590 in conjunction with an assessment code (e.g., A007) when the influenza vaccine is administered during a visit for other clinical concerns.
- Use G590 plus G700 when the patient presents exclusively for the influenza immunization and no other assessment or consultation is billed.
Common Pitfalls
- Billing G590 for patients in a nursing home, as this is included in the W010 Monthly Management fee and will be rejected as a duplicate.
- Attempting to claim G700 alongside an assessment or consultation code; G700 is strictly for visits where the immunization is the sole reason for the encounter.
- Billing G590 for hospital-based patients where the facility fee structure may already cover the administration cost.
Billing Tips
- G590 is a delegable procedure, meaning it can be billed when performed by a nurse or other qualified staff under your supervision, provided the requirements in GP62/GP63 are met.
- You may bill G590 on the same day as a counselling code like K013 or K040, as these are not considered assessments for the purpose of G700 eligibility.
Effective: April 1, 2026
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Procedure
Diagnostic and Therapeutic Procedures, Delegated Procedure
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