G344 – Phentolamine test
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
G344 is for a phentolamine test. This service is classified as a Diagnostic and Therapeutic Procedure. As with all insured services, it includes the common elements outlined in - of the Schedule, such as obtaining history, maintaining records, and conferring with other professionals.
When to Use
- Use G344 when performing a pharmacological challenge test to diagnose or rule out pheochromocytoma in a patient with suspected catecholamine excess.
- Use this code specifically for the administration and monitoring of the phentolamine challenge, distinct from routine office visits or consultations.
Common Pitfalls
- Do not bill G344 in conjunction with an office visit code like A007, as the procedure fee is intended to be comprehensive for the diagnostic test.
- Avoid using G344 for routine blood pressure monitoring or general hypertension management, as it is strictly reserved for the specific pharmacological diagnostic test.
Billing Tips
- Ensure the medical record explicitly documents the phentolamine dosage, the patient's baseline vital signs, and the serial monitoring results to justify the diagnostic procedure claim.
- If the test is performed in an emergency or hospital setting, you may append the appropriate Special Visit Premium from Tables I-III to the G344 claim.
Effective: April 1, 2025
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Procedure
Diagnostic and Therapeutic Procedures
In accordance with , all insured services must be documented in appropriate records. The Act requires that the record establish that: 1. an insured service was provided; 2. the service for which the account is submitted is the service that was rendered; and 3. the service was medically necessary.
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