G655 – Technical component - 12 to 35 hours scanning
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
This is the technical component for scanning a continuous ECG monitoring recording for a duration of 12 to 35 hours. This service falls under Level 2 criteria, which applies to monitoring devices with fewer than three skin electrodes, or those that record only portions of the monitoring period or do not provide trend analysis. A minimum of 12 hours of monitoring is required. This service is one of three components for a Holter study, typically billed with a recording component (G654) and a professional component (G653).
When to Use
- Use G655 for the technical scanning component when the Holter device utilizes fewer than three skin electrodes, meeting the Level 2 criteria.
- Use this code for devices that record only intermittent portions of the monitoring period rather than continuous full-waveform data.
- Use G655 when the monitoring duration is at least 12 hours but does not exceed 35 hours.
Common Pitfalls
- Billing G655 alongside G651 or G652 is a common error, as those codes represent different levels of scanning complexity that are mutually exclusive.
- Submitting G655 without the corresponding G654 (recording) and G653 (professional) components will often trigger a rejection or audit flag for an incomplete Holter study.
- Failing to account for the 5.32% reduction when the service is performed in a hospital setting leads to incorrect revenue projections.
Billing Tips
- Ensure the total duration of the recording is clearly documented as at least 12 hours to satisfy the minimum threshold for G655 eligibility.
- Verify that the device used qualifies as Level 2; if the device provides full trend analysis or uses three or more electrodes, G651 or G652 may be the appropriate technical scanning code instead.
Effective: April 1, 2026
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Diagnostic
Diagnostic and Therapeutic Procedures
Minimum 12 hours of monitoring required.
1. Maximum one professional component, one technical recording component and one technical scanning component per patient, per recording.
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