G471 – Complex neuromuscular electrodiagnostic testing - technical component
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
Complex neuromuscular electrodiagnostic testing requiring a minimum of 60 minutes of direct physician involvement. The testing must include ten (10) or more electrodiagnostic studies, performed through any combination of the following: a. Nerve conduction studies b. Late motor response studies c. Needle electromyography of distinct muscles d. Repetitive stimulation of muscle-nerve pairs e. Autonomic function studies.
When to Use
- Use G471 for comprehensive evaluations of complex conditions like amyotrophic lateral sclerosis or multifocal motor neuropathy where 10+ distinct studies are required.
- Select G471 when performing extensive diagnostic workups for suspected brachial or lumbosacral plexopathies that necessitate a minimum of 60 minutes of direct physician time.
Common Pitfalls
- Billing G471 on the same day as G455 or G466 will result in an automatic rejection due to explicit billing restrictions.
- Failure to explicitly document the start and stop time in the medical record is the most frequent cause of clawbacks during OHIP audits for this code.
- Counting fewer than 10 distinct electrodiagnostic studies or failing to meet the 60-minute threshold will lead to claim rejection or recovery.
Billing Tips
- Ensure your clinical notes clearly itemize the 10+ individual studies performed to justify the 'complex' designation required by the Schedule of Benefits.
- If performing these services in a hospital setting, remember that the fee is adjusted to 86.10% of the listed value per General Preamble GP11.
Effective: April 1, 2026
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Diagnostic
Diagnostic and Therapeutic Procedures
The start and stop time must be recorded in the patient's medical record or the service is not eligible for payment. See General Preamble and for definitions and time-keeping requirements.
Ready to bill this code?
SnapBill makes OHIP billing simple — auto-filled codes, validation, and batch submission.