G866 – Intermittent haemodialysis - at an auxiliary treatment centre
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
Intermittent haemodialysis rendered at an auxiliary treatment centre, payable per treatment. As per the note on , where 3 or more treatments are rendered per 7-day period at an auxiliary treatment centre, the service comprises the chronic dialysis weekly team fee paid at the full amount, regardless of the number of treatments rendered. In such cases, G866 is not the appropriate code to bill.
When to Use
- Use G866 for individual intermittent haemodialysis sessions performed at an auxiliary treatment centre when the patient receives fewer than three treatments within a rolling 7-day period.
- Use this code for patients who are not part of a chronic dialysis program that qualifies for the weekly team fee structure under G860-G865.
Common Pitfalls
- Billing G866 for patients receiving three or more treatments per week will result in automatic rejection or recovery, as the weekly team fee (G860-G865) must be used instead.
- Submitting G866 for dialysis performed in a hospital setting rather than an auxiliary treatment centre violates the site-specific definition of the code.
Billing Tips
- Monitor the patient's weekly treatment frequency closely; if a patient's schedule increases to three or more treatments, immediately switch to the appropriate G860-G865 weekly team fee to avoid audit discrepancies.
Effective: April 1, 2026
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Procedure
Diagnostic and Therapeutic Procedures
1. Claim the code representing the predominant location and modality.
2. Where 3 or more treatments are rendered per 7-day period at an auxiliary treatment centre, the service comprises the chronic dialysis weekly team fee paid at the full amount, regardless of the number of treatments rendered.
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