G104 – Positional testing with electronystagmography (ENG) - technical component
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
This fee code represents the technical component for Positional testing with electronystagmography (ENG). It covers the use of the equipment, premises, supplies, and technical personnel required for the procedure. This service is intended to be billed with the corresponding professional component, G105, which covers the physician's interpretation. Per , the technical component is subject to specific payment rules when rendered in a hospital and requires the claiming physician to oversee a quality assurance process.
When to Use
- Use G104 when you are the physician responsible for the equipment and technical oversight of positional ENG testing, provided you are also billing the interpretation under G105.
- Apply this code specifically for the technical component of positional testing in a private office setting where you own or lease the diagnostic equipment.
Common Pitfalls
- Billing G104 for tests performed in a hospital setting without applying the mandatory 86.10% reduction required by GP11 rules.
- Submitting G104 without a corresponding G105 claim, as the Ministry expects the technical component to be paired with the professional interpretation component.
Billing Tips
- Ensure your billing software is configured to automatically apply the 13.9% reduction to G104 when the service location is identified as a hospital to avoid manual calculation errors.
Effective: April 1, 2026
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Diagnostic
Diagnostic and Therapeutic Procedures
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