G120 – Impedance plethysmography - professional component
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
Represents the professional component (interpretation and report) for impedance plethysmography. This service is typically billed in conjunction with the technical component, which is covered by G121. As per the definition of a professional component on page , this fee represents the physician's work and expertise in analyzing the results of the procedure.
When to Use
- Use G120 when you are providing the formal interpretation and written report for an impedance plethysmography study performed in a facility or clinic setting.
- Bill G120 in conjunction with G121 when you are the physician responsible for both the technical performance and the professional interpretation of the diagnostic test.
Common Pitfalls
- Billing G120 without a corresponding, signed, and dated interpretation report in the patient chart will lead to full recovery during an audit.
- Attempting to bill G120 as a standalone service when the technical component (G121) was not performed or was performed by a facility that already claims the global fee.
Billing Tips
- Always ensure the referral source is clearly documented in the patient record, as G120 requires a valid referral from a physician, nurse practitioner, or oral and maxillofacial surgeon.
Effective: April 1, 2025
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Diagnostic
Diagnostic and Therapeutic Procedures
As a professional component service, the physician is responsible for the interpretation and report of the procedure. The technical component (G121) covers the actual performance of the test, including equipment and personnel ().
Referral for this diagnostic procedure may be made by a physician, a nurse practitioner, or an oral and maxillofacial surgeon under specific conditions as outlined on page .
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