G683 – Continuous ECG monitoring technical component - 36 to 59 hours scanning
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
This service represents the technical component for scanning a Level 1 continuous electrocardiographic (ECG) recording that lasts between 36 and 59 hours. A Level 1 device must be capable of recording three or more simultaneous channels and acquiring a continuous ambulatory electrocardiographic recording of all beats, using three or more skin electrodes. The device must also have the ability to analyze and manually review all parts of the recording, and to produce graphical and quantitative reports of relevant parameters and diagnostic quality tracings for visual review, including post-hoc review of any portion of the recording to enable diagnostic rhythm analysis. The service must include a patient diary and event marker capability to enable symptom-rhythm correlation. Minimum 12 hours of monitoring.
When to Use
- Use G683 when the Holter monitor recording duration is confirmed to be between 36 and 59 hours inclusive.
- Select this code when the technical scanning process involves a 3-channel (or more) device that meets the full Level 1 diagnostic criteria.
Common Pitfalls
- Billing G683 alongside G652, G685, or G687 will trigger an automatic rejection as these represent conflicting technical scanning components for the same recording period.
- Claiming G683 for recordings under 36 hours is a common audit trigger; ensure the total duration is verified before submission to avoid recovery of funds.
- Failing to apply the 94.68% fee reduction when the technical component is performed within a hospital setting is a frequent billing error.
Billing Tips
- Always verify the exact start and end times of the recording to ensure the 36-59 hour window is met, as falling outside this range requires billing G682 (under 36 hours) or G684 (60+ hours).
Effective: April 1, 2026
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Diagnostic
Diagnostic and Therapeutic Procedures
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.
Maximum one professional component, one technical recording component and one technical scanning component per patient, per recording.
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