G149 – Visual evoked response - simple - technical component
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
G149 is the technical component fee for a simple visual evoked response, an electrodiagnostic test used in ophthalmology. This service is performed in conjunction with the professional component, G147, which covers the interpretation. Requirements: According to , the physician claiming the technical component must: - Have the necessary training and experience to personally render the service. - Maintain documentation describing the quality assurance process. The claiming physician is responsible for the complete quality assurance process for all elements of the technical component, including data acquisition, reporting, and record keeping. Payment Rules: - When the service (as G149A) is rendered in a hospital, the fee is payable at 94.68% of the listed fee (). - The technical component is not eligible for payment if the service is rendered to a patient who is an in-patient of a hospital, or attends a hospital and within 24 hours is admitted to the same hospital for the same condition ().
When to Use
- Use G149 when you are the physician responsible for the technical acquisition and quality assurance of a simple visual evoked response in an office or non-hospital setting.
- Use G149 in conjunction with G147 when you perform both the technical data acquisition and the professional interpretation of the test.
Common Pitfalls
- Billing G149 for a patient who is an inpatient or is admitted to the hospital within 24 hours of the test will result in a mandatory rejection per GP11.
- Failing to maintain a documented quality assurance log for the equipment and data acquisition process is a common audit failure that leads to full recovery of G149 payments.
- Submitting G149 for hospital-based services without applying the required 94.68% fee reduction will trigger an automatic adjustment or rejection.
Billing Tips
- Ensure your billing software is configured to automatically apply the 94.68% reduction when the service location is set to a hospital to avoid manual calculation errors.
- Always link G149 with G147 on the same claim submission to ensure the professional and technical components are processed together for the same diagnostic event.
Effective: April 1, 2026
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Diagnostic
Diagnostic and Therapeutic Procedures
The physician has the necessary training and experience to personally render the technical component of the service.
The physician maintains documentation that describes the process by which the physician monitors quality assurance in accordance with professional standards.
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