What is OHIP billing code Z821?

Z821 is "Injection of diagnostic or therapeutic agent into shunt apparatus", an OHIP Psychiatric code from the Ontario Schedule of Benefits (Physician Services).

How much does Z821 pay?

The current OHIP fee for Z821 is $53.10, effective 2025-04-01, per the Ontario Schedule of Benefits.

How do I bill Z821 to OHIP?

Z821 is submitted through OHIP's MCEDT claims system, either directly or via billing software. SnapBill validates Z821 claims against the Schedule of Benefits rules before submission.

All codes

Z821

Z821 – Injection of diagnostic or therapeutic agent into shunt apparatus

OHIP Psychiatric Code — NEUROLOGICAL SURGICAL PROCEDURES · Schedule of Benefits

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A surgical procedure listed in the Neurological Surgical Procedures section (X. Neurological Surgical Procedures), specifically under CRANIAL > CSF SHUNTING PROCEDURES. Specific details regarding the procedure, its requirements, and limitations are not available in the provided context. Refer to the specific section of the Schedule for detailed information. General rules from the preamble apply. - As per , this service is eligible for age-based fee premiums for patients under 16 years of age. - Per , after-hours premiums (E409, E410) may apply if the procedure is non-elective or delayed by an emergency. - The trauma premium (E420) may be applicable for major trauma patients (). - Note on Admission Assessments: For procedures prefixed with a 'Z', a prior assessment by the surgical specialist for the same illness results in the admission assessment being deemed a specific re-assessment ().

When to Use

Use Z821 for the percutaneous injection of contrast media into a CSF shunt reservoir for a shuntogram to evaluate patency.
Use Z821 for the therapeutic injection of antibiotics or other agents directly into a shunt reservoir for the management of shunt-related infections.

Common Pitfalls

Billing Z821 in addition to a consultation or visit code on the same day without recognizing that the admission assessment is deemed a re-assessment per GP23.
Attempting to claim Z821 alongside a separate imaging interpretation code; ensure the procedure code captures the full scope of the intervention if the imaging is integral to the shuntogram.

Billing Tips

Always apply the appropriate age-based fee premium (GP64) for patients under 16, as this is a surgical procedure listed in the Z-section.
If the procedure is performed after hours due to an emergency (e.g., suspected shunt failure), ensure you append E409 or E410 to the Z821 claim to capture the 50-75% procedural premium.

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Provider Fee$53.10

Effective: April 1, 2025

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