G358 – Growth hormone exercise stimulation test
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
Growth hormone exercise stimulation test performed with a physician present. The fee for this service includes any required venipunctures. This service is classified as a diagnostic and therapeutic procedure and is subject to all common and constituent elements of insured services as outlined on pages - of the Schedule of Benefits.
When to Use
- Use G358 when performing a formal exercise-based stimulation test to evaluate growth hormone deficiency in a clinical setting.
- Use this code specifically when the physician is physically present to monitor the patient during the exercise protocol and subsequent blood draws.
Common Pitfalls
- Do not bill G489 (venipuncture) separately, as the G358 fee explicitly includes all required venipunctures.
- Avoid billing G358 if the physician is not present for the duration of the test, as the billing requirement mandates physician presence.
Billing Tips
- Ensure the medical record clearly notes the start and end times of the exercise stimulation and the physician's active supervision to support the claim during an audit.
Effective: April 1, 2025
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Procedure
Diagnostic and Therapeutic Procedures
The service description explicitly requires the physician to be present.
As per , all insured services must be documented in the medical record to establish that: 1. an insured service was provided; 2. the service for which the account is submitted is the service that was rendered; and 3. the service was medically necessary.
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