G140 – Evoked potentials - technical component
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
This service represents the technical component for performing evoked potential tests on the upper or lower limbs. It is associated with the professional component, G138. The fee is subject to reduction if only one limb is tested or if the service is performed in a hospital setting. The claiming physician is responsible for all quality assurance aspects of the technical component.
When to Use
- Use G140 when you are the physician responsible for the technical data acquisition and quality assurance of evoked potential testing, while billing G138 for the professional interpretation.
- Apply G140 when performing evoked potentials on both upper or lower limbs in an office setting to claim the full technical fee.
Common Pitfalls
- Failing to reduce the claim to 50% of the fee when only a single limb is tested, which will trigger an automatic rejection or audit recovery.
- Billing the full fee for G140 when the service is performed within a hospital setting, as this requires a mandatory 13.9% reduction to 86.10% of the listed fee.
- Claiming G140 without being able to produce documentation of the quality assurance process for data acquisition, as this is a specific MOH audit requirement.
Billing Tips
- Ensure your billing software is configured to automatically apply the 86.10% hospital reduction when the service location is coded as a hospital facility to avoid manual calculation errors.
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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