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Billing code

G457A — EMG/nerve conduction Schedule B (limited) – professional component

Limited EMG/nerve study, interpretation

Bill G457 for interpreting a limited nerve conduction or needle EMG study, such as a single nerve.

Watch for: Not payable with G473 for the same patient the same day; surface EMG is not payable.

Code

G457A

Description

EMG/nerve conduction Schedule B (limited) – professional component

FHO+ basket

Not in the FHO+ base rate basket (Schedule 2 or 2B).

Effective date

Apr 1, 2026

Termination date

No end date

Explanation

Updated October 26, 2026

Professional component of a limited nerve conduction or needle EMG study (Schedule B), such as a single nerve.

What it covers

Schedule B is the limited procedure: conduction studies on a single nerve (motor and/or sensory) and/or limited EMG of the involved muscle(s), and/or a limited neuromuscular transmission study (J103).

The technical component is G466 (J103).

Billing rules

• If the patient is referred directly to the EMG/nerve conduction facility for testing, a consultation or assessment by you is not payable, unless the referring provider also asks for a medically necessary consultation or assessment (J103).
• Schedules A, B, C and single fibre EMG require an intramuscular needle recording electrode. Surface EMG and other EMG techniques are not payable (J103).
• Late responses or reflexes are included if done. Keep a permanent record of the nerve conduction study in the chart (J103).
• G473 (Schedule C professional) is not payable with G457 for the same patient the same day (J104).
• You must personally interpret the results. Supervision and monitoring may be delegated to another physician (J1).

Often billed with

• G466 Schedule B technical component (J103).

Common rejections

• ADH: OHIP describes this as 'Cannot be billed together': G473 and G457 can't be paid for the same patient the same day (J104).

Related codes: G466, G456, G455, G473, G458

Source: Schedule of Benefits (July 1, 2026), Diagnostic and Therapeutic Procedures, Physical Medicine, Needle Electromyography and Nerve Conduction Studies, page J103.

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