G034 – Serial tube 4 or more antigens
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
A laboratory medicine diagnostic procedure for a serial tube test using four or more antigens. This service is insured when ordered by a physician or nurse practitioner (). As with all insured services, it must be medically necessary and appropriately documented in the patient's medical record ().
When to Use
- Use G034 when performing a serial tube dilution test specifically requiring the use of four or more distinct antigens for diagnostic assessment.
- Select G034 for laboratory procedures where the complexity of the antigen panel meets the four-antigen threshold, distinguishing it from simpler diagnostic tests.
Common Pitfalls
- Billing G034 when fewer than four antigens are utilized, which constitutes an incorrect claim and potential audit risk for over-billing.
- Submitting G034 without clear documentation of the specific antigens tested, which is required to substantiate the medical necessity of the serial tube procedure.
Billing Tips
- Ensure the laboratory requisition or procedure note explicitly lists the four or more antigens tested to support the claim during a post-payment review.
Effective: April 1, 2026
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Laboratory
Diagnostic and Therapeutic Procedures
All insured services must be documented in appropriate records. The Act requires that the record establish that: 1. an insured service was provided; 2. the service for which the account is submitted is the service that was rendered; and 3. the service was medically necessary.
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