G466 – Limited procedure - technical component
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
This is the technical component fee for a Schedule B limited needle electromyography (EMG) or nerve conduction study (NCS). The procedure involves conduction studies on a single nerve (motor and/or sensory), and/or limited EMG studies of involved muscle(s), and/or a limited neuromuscular transmission study. This fee covers the use of equipment and personnel for the procedure. The professional component is billed separately under G457. As per the preamble on page , a permanent record of the procedure must be maintained.
When to Use
- Use G466 when performing a limited nerve conduction study on a single nerve or a limited needle EMG of specific muscles in an office setting where you own the equipment.
- Bill G466 in conjunction with G457 when you personally perform both the technical and professional components of a limited diagnostic study.
Common Pitfalls
- Billing G466 on the same day as G471 will trigger an automatic rejection, as these codes are mutually exclusive for the same patient.
- Failing to apply the 86.10% payment adjustment when the technical component is performed within a hospital setting is a common source of claim discrepancies.
- Attempting to bill a consultation or assessment fee alongside G466 is prohibited unless a separate, medically necessary consultation was explicitly requested by the referring provider.
Billing Tips
- Ensure your claim includes both G466 for the technical component and G457 for the professional component to maximize the total allowable fee for the procedure.
Effective: April 1, 2026
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Diagnostic
Diagnostic and Therapeutic Procedures
A permanent record of the procedure must be maintained in the patient chart.
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.
If a physician owns the EMG/NCS equipment and either employs and provides clinical supervision for a technician to perform the procedure or performs the procedure personally, then both the technical and the professional component are payable to the physician.
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