G271 – Anticoagulant supervision - long-term, telephone advice
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
In addition to the common elements, the components of this service include the following specific elements: - A. Monitoring the condition of a patient with respect to anticoagulant therapy, including ordering blood tests, interpreting the results and inquiry into possible complications. - B. Adjusting the dosage of the anticoagulant therapy and, where appropriate, prescribing other therapy. - C. Discussion with, and providing advice and information to the patient or patient's representative, by telephone, on matters related to the service even when initiated by the patient or patient's representative. - D. Making arrangements for any related assessments, procedures or therapy and interpreting results as appropriate. - E. Providing premises, equipment, supplies and personnel for the specific elements.
When to Use
- Use G271 when managing a patient on long-term anticoagulation (e.g., Warfarin) where the primary interaction is a telephone call to adjust dosage based on INR results.
- Use this code for patients who are stable on therapy but require periodic monitoring and dosage adjustments outside of a formal in-person office visit.
Common Pitfalls
- Billing G271 for a patient in a nursing home or home for the aged is a direct violation if W010 is claimed by any physician for that same month.
- Attempting to bill G271 on the same day as an in-person office visit (A007) for the same clinical management is generally considered double-billing for the same service.
Billing Tips
- Ensure your clinical notes specifically document the INR result, the dosage adjustment made, and the telephone conversation with the patient or their representative to satisfy the specific elements of the code.
Effective: April 1, 2026
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
ManagementFee
Diagnostic and Therapeutic Procedures
All insured services must be documented in appropriate records to 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.
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