J331 – Estimate of shunt (Qs/Qt) breathing pure oxygen
OHIP Cardio-Thoracic Surgery Code — PULMONARY FUNCTION STUDIES · Schedule of Benefits
Estimate of shunt (Qs/Qt) breathing pure oxygen. This is a diagnostic procedure listed in the Pulmonary Function Studies section of the Schedule of Benefits. Payment is divided into a technical component ('H' Fee) and a professional component ('P' Fee).
When to Use
- Use J331 when performing a formal shunt study in a patient with refractory hypoxemia to quantify the intrapulmonary or intracardiac shunt fraction while the patient is breathing 100% oxygen.
- Use J331 specifically for the diagnostic assessment of pulmonary vascular malformations or severe ventilation-perfusion mismatch where standard pulse oximetry or blood gas analysis is insufficient for clinical management.
Common Pitfalls
- Failing to split the claim into the 'H' (technical) and 'P' (professional) components, which will result in an automatic rejection or underpayment.
- Billing J331 for routine arterial blood gas analysis or standard spirometry, which are covered under different fee codes and do not meet the diagnostic criteria for a shunt study.
- Neglecting to maintain the required quality assurance documentation for the technical component, which is a mandatory audit requirement for all pulmonary function studies.
Billing Tips
- Ensure the claim includes the referring physician's information, as J331 requires a valid referral from a physician, nurse practitioner, or oral maxillofacial surgeon.
- If the procedure is performed on an emergency basis after hours, append the appropriate premium code (E409, E410, E412, or E413) to the procedural fee to ensure correct percentage-based reimbursement.
Effective: April 1, 2025
H. Pulmonary Function Studies
PULMONARY FUNCTION STUDIES
Diagnostic
Pulmonary Function Studies
The physician submitting a claim for the technical component is responsible for the complete quality assurance process for all elements of the technical component of the service, including data acquisition, reporting, and record keeping. The physician must be able to demonstrate the above upon request by the MOH.
All insured services must be documented in appropriate records establishing 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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