G035 – Titre - serial tube single antigen
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
This service is a laboratory medicine procedure for a titre - serial tube single antigen test. As per the General Preamble, all insured services must be medically necessary and documented in the patient's medical record. The fee for this service includes all common and constituent elements of an insured service as outlined in -.
When to Use
- Use G035 when performing a serial tube titration for a single antigen to quantify antibody levels, distinguishing it from the qualitative screening approach of G030.
- Select G035 when the clinical requirement necessitates a precise dilution series to determine the endpoint titer, rather than a simple presence or absence test.
Common Pitfalls
- Billing G035 in conjunction with other G-series laboratory codes for the same antigen on the same day will trigger a rejection for unbundling.
- Failing to ensure the requisition explicitly justifies the need for a serial dilution titer, as standard qualitative tests are often sufficient for routine screening.
Billing Tips
- Ensure the laboratory requisition clearly specifies the serial dilution methodology to support the use of G035 over lower-complexity diagnostic codes.
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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