What are the billing rules for G593A?

Marked (+): when the immunization is the sole reason for the visit, add G700, once per patient per day however many vaccines or (+) procedures are given (J3, J54). G700 is not payable in hospital, and is paid at 15% of its fee for patients enrolled to a capitation-based group (J3). FHO: when the patient attends solely for the COVID-19 vaccine, bill Q593A in lieu of G700, for enrolled and non-enrolled patients (Agreement p.72 §11.8). Appendix Q lists Q593A for FHO, FHN and several other models (AQ3, information only).

What is G593A often billed with?

G700 when the vaccine is the only reason for the visit (J3, J54); FHO: Q593A instead of G700 (Agreement p.72 §11.8). An assessment such as A001 when the vaccine is given during a regular visit; G700 isn't added then, because the vaccine isn't the sole reason (A4, J3).

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Billing code

G593A — Covid-19 Vaccine

Q: What is OHIP billing code G593A?

COVID-19 vaccine. Add G700 when it's the only reason for the visit; FHO physicians bill Q593A instead of G700.

COVID-19 vaccine

Bill G593 for a COVID-19 vaccine; add G700 when it is the only reason for the visit, or Q593A for FHO physicians.

Watch for: G700 isn't added when an assessment is billed, and only one of Q590A or Q593A is payable per patient per year.

Provider	Specialist	Assistant	Anaesthetist	Non-anaesthetist
$13.00	$0.00	$0.00	$0.00	$0.00

Code: G593A
Description: Covid-19 Vaccine
FHO+ basket: Not in the FHO+ base rate basket (Schedule 2 or 2B).
Effective date: Apr 1, 2025
Termination date: No end date

Explanation

Updated October 26, 2026

COVID-19 vaccine. Add G700 when it's the only reason for the visit; FHO physicians bill Q593A instead of G700.

What it covers

G593 is the immunization code for a COVID-19 vaccine (J54). Vaccines without their own code are G538; influenza is G590 (J54).

Billing rules

Marked (+): when the immunization is the sole reason for the visit, add G700, once per patient per day however many vaccines or (+) procedures are given (J3, J54).
G700 is not payable in hospital, and is paid at 15% of its fee for patients enrolled to a capitation-based group (J3).
FHO: when the patient attends solely for the COVID-19 vaccine, bill Q593A in lieu of G700, for enrolled and non-enrolled patients (Agreement p.72 §11.8). Appendix Q lists Q593A for FHO, FHN and several other models (AQ3, information only).
Only one of Q590A or Q593A is payable per patient per year (Agreement p.72 §11.7–11.8).
May be delegated to trained office staff, even when you aren't on site, for your own patient; the chart must name who gave it (GP62–GP63).
Payable on the same day as a counselling service by the same physician (GP58).
The Schedule notes an immunization may be uninsured in some circumstances and refers to section 24 of Regulation 552 under the Health Insurance Act (J54, AA1).
FHO: not listed in Schedule 2 or 2A (core services), so not part of the base rate basket (Agreement pp.75–86). Physicians in the FHO Income Stabilization program may bill G593A at full fee-for-service value (Agreement p.99 §3.6).

Often billed with

G700 when the vaccine is the only reason for the visit (J3, J54); FHO: Q593A instead of G700 (Agreement p.72 §11.8).
An assessment such as A001 when the vaccine is given during a regular visit; G700 isn't added then, because the vaccine isn't the sole reason (A4, J3).

Related codes: G700, Q593, G590, Q590, G538

Source: Schedule of Benefits (July 1, 2026), Diagnostic and Therapeutic Procedures, Injections or Infusions — Immunization, page J54; Appendix Q (information only), page AQ3; FHO Agreement 2026-04 p.72.

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