G451 – Caloric testing with ENG - technical component
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
Represents the technical component of caloric testing with electronystagmography (ENG) and is performed per ear. The professional component for interpretation must be billed separately using G533. When rendered in a hospital, this service is payable at 86.10% of the listed fee in the Schedule (T fee) as per (billed as G451A).
When to Use
- Use G451 when performing the technical data acquisition for caloric testing in a clinic setting to bill for the equipment and technician time.
- Use G451A specifically when the technical component of the caloric testing is performed within a hospital facility to trigger the 86.10% fee adjustment.
Common Pitfalls
- Billing G451 without a corresponding G533 claim for the professional interpretation, which is required to complete the diagnostic service cycle.
- Submitting G451 for a patient who is admitted to the hospital within 24 hours of the test, as this violates the global fee rules for hospital-based diagnostic services.
Billing Tips
- Ensure you append the 'A' suffix (G451A) when billing for hospital-rendered services to automatically apply the 86.10% payment adjustment required by GP11.
Effective: April 1, 2026
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Diagnostic
Diagnostic and Therapeutic Procedures
The physician submitting a claim for the technical component is responsible for the complete quality assurance process for all elements of the technical component of the service, including data acquisition, reporting, and record keeping. The physician must be able to demonstrate the above upon request by the MOH.
The physician must maintain documentation that describes the process by which the physician monitors quality assurance in accordance with professional standards.
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