G515 – Open circuit indirect calorimetry
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
Open circuit indirect calorimetry involves an isothermal environment employing a ventilated hood system, and includes: - height and weight of the subject - measurement of subjects body fat using four skin folds - determination of resting energy expenditure in a patient 12-14 hours post prandial - measurement of consumption and saturation.
When to Use
- Use G515 when performing a comprehensive metabolic assessment requiring precise resting energy expenditure measurement in a patient who has fasted for 12-14 hours.
- Select G515 specifically when the clinical protocol necessitates the use of a ventilated hood system for indirect calorimetry rather than simpler metabolic screening tools.
Common Pitfalls
- Billing G515 alongside G514 or G520 within the same calendar month will trigger an automatic payment adjustment to the G520 rate, resulting in a loss of revenue.
- Failure to document all four required skin fold measurements or the specific O2/CO2 saturation data will lead to claim rejection during an audit as these are mandatory components of the service.
Billing Tips
- Ensure the referral source is clearly documented as a physician or nurse practitioner, as G515 strictly requires a formal referral per GP111 guidelines.
Effective: April 1, 2025
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Diagnostic
Diagnostic and Therapeutic Procedures
Patient's height and weight.
Measurement of patient's body fat using four skin folds.
Measurement of consumption and saturation.
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