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G300
G300 – Metabolic studies
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
Metabolic studies, e.g. coronary sinus lactate and pyruvate determinations. This service is listed under the Cardiovascular subsection of Diagnostic and Therapeutic Procedures.
When to Use
- Use G300 when performing specific metabolic determinations such as coronary sinus lactate and pyruvate levels during cardiac catheterization.
- Use G300 for invasive metabolic sampling procedures that are distinct from standard diagnostic imaging or routine blood work.
Common Pitfalls
- Billing G300 for routine laboratory blood tests is a common error; it is strictly intended for invasive procedural metabolic studies.
- Failing to document the specific metabolic markers (e.g., lactate, pyruvate) and the invasive nature of the collection will lead to audit recovery.
- Attempting to claim G300 in conjunction with other diagnostic codes that already include metabolic sampling as part of their global fee.
Billing Tips
- Ensure the claim includes the appropriate After Hours Procedure Premium (E409 or E410) if the procedure is non-elective and performed outside standard daytime hours.
- Always verify that the referral source is clearly documented, as G300 requires a formal referral from a physician or nurse practitioner to be eligible for payment.
Provider Fee$110.95
Surgical Assistant Fee$55.48
Effective: April 1, 2025
Category
J. Diagnostic and Therapeutic Procedures
Subcategory
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Service Type
Procedure
Code Classes
Diagnostic and Therapeutic Procedures
Referral RequiredFrom: Physician, NursePractitioner
The medical record must establish that an insured service was provided, the service for which the account is submitted is the service that was rendered, and the service was medically necessary as per .
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