G442 – Impedance audiometry - technical component
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
G442 is the technical component fee for impedance audiometry, an advanced diagnostic hearing test listed in the Otolaryngology section of the Schedule. The service can be performed using either manual or automated methods. As noted on page , this may include stapedial reflex and/or compliance testing. The corresponding professional component is billed using G529. When this service is rendered in a hospital, payment for this service is subject to a reduction as outlined on page .
When to Use
- Use G442 to bill for the technical performance of impedance audiometry, such as tympanometry or acoustic reflex testing, when the equipment and staff are provided by your office.
- Always pair G442 with G529 when you are the physician responsible for both the technical acquisition and the professional interpretation of the impedance audiometry results.
Common Pitfalls
- Billing G442 in a hospital setting without applying the mandatory 13.9% reduction required by the GP11 rules will result in automated claim adjustments or audit flags.
- Submitting G442 without a valid referral from a physician, nurse practitioner, or oral maxillofacial surgeon as per GP111 requirements will lead to claim rejection.
- Attempting to bill G442 when the test is performed by a hospital-employed technician using hospital-owned equipment is an improper claim, as the technical component is already covered by the hospital global budget.
Billing Tips
- Ensure your billing software is configured to automatically apply the 86.10% payment adjustment for G442 when the service location is coded as a hospital facility.
- Maintain a clear log of quality assurance checks for your impedance equipment to satisfy the specific documentation requirements mandated by the Ministry of Health for the technical component.
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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