Z430 – Provision of anaesthetic services for patients undergoing magnetic resonance imaging
OHIP Psychiatric Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
markdown Provision of anaesthetic services for patients undergoing magnetic resonance imaging (MRI). The amount payable is calculated by adding 6 base units to the applicable time units and multiplying the total by the anaesthesiologist unit fee (). Time is calculated per 15-minute increment or part thereof, starting when the anaesthesiologist begins initiating anaesthesia in the operating room and ending when the patient is safely transferred to post-operative supervision (). The general anaesthesia service includes: - A pre-anaesthetic evaluation. - The anaesthetic procedure and all associated supportive measures. - Post-anaesthetic follow-up care. This service is eligible for various add-on premiums, including after-hours premiums (E400C, E401C), special visit premiums (C998C, C985C, C999C), and extra units for patient-specific factors like age, ASA status, or BMI ().
When to Use
- Use Z430 when providing monitored anaesthesia care or general anaesthesia specifically for a patient undergoing an MRI procedure in a hospital setting.
- Select Z430 instead of standard surgical anaesthesia codes when the primary diagnostic procedure is an MRI, as it accounts for the unique environment and base unit requirements of the imaging suite.
Common Pitfalls
- Failing to include the required 6 base units in the calculation, which leads to underpayment compared to the standard anaesthesia fee schedule.
- Incorrectly calculating time units by starting the clock at patient arrival rather than when anaesthesia initiation actually begins, or ending it before the patient is transferred to post-operative supervision.
- Attempting to bill Z430 alongside other surgical anaesthesia codes for the same session, which will trigger a rejection for duplicate service.
Billing Tips
- Ensure you append the correct suffix 'C' to the code and accurately document the start and end times to justify the total time units claimed beyond the 6 base units.
- Review GP97 to verify eligibility for additional units based on patient-specific factors like ASA status or BMI, which can be claimed in addition to the base 6 units for Z430.
Effective: April 1, 2025
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Procedure
Anaesthesiologists' Services, Diagnostic and Therapeutic Procedures
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