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J311
J311 – Functional residual capacity by gas dilution method
OHIP Cardio-Thoracic Surgery Code · Schedule of Benefits
A diagnostic pulmonary function study to determine functional residual capacity using the gas dilution method. The service is divided into professional and technical components.
When to Use
- Use J311 when gas dilution is the clinically indicated method to measure functional residual capacity, specifically for patients where body plethysmography (J307) is contraindicated or unavailable.
- Select J311 for patients with suspected air trapping or hyperinflation where a precise measurement of lung volumes is required for diagnostic confirmation.
Common Pitfalls
- Billing J311 on the same day as J307 will trigger an automatic rejection as these are mutually exclusive methods for assessing lung volumes.
- Attempting to bill the technical component (Suffix B) for services performed in a private clinic or office setting will result in a claim rejection, as this suffix is strictly reserved for hospital-based services.
- Failing to separate the claim into professional (Suffix C) and technical (Suffix B) components will lead to payment errors or under-billing.
Billing Tips
- Ensure the interpretive report is personally signed and dated by the physician to satisfy the professional component requirement for Suffix C.
Provider Fee$0.00
Surgical Assistant Fee$18.95
Anaesthetist Fee$21.00
Non-Anaesthetist Fee$21.00
Effective: April 1, 2026
Service Type
Pulmonary Function Study
Code Classes
Diagnostic
For services rendered outside a hospital setting, only the professional component (Suffix C) is billable to OHIP.
Technical component 'H' refers to hospital-based technical services.
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