G800 – Hyperbaric oxygen therapy - first 1/4 hour
OHIP Diagnostic & Therapeutic Procedures Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
Hyperbaric Oxygen Therapy (HBOT) is the service rendered when a physician administers and supervises HBOT. The specific elements of HBOT are those of an assessment as defined in , including ongoing monitoring of the patient's condition and intervening as appropriate. This service, G800, is for the first 1/4 hour of a session where the physician is in constant attendance inside the chamber with the patient(s). Time is calculated based on the period of physician supervision while each patient receives HBOT inside the chamber.
When to Use
- Use G800 when you are physically inside the hyperbaric chamber providing constant attendance and supervision for the first 15 minutes of the session.
- Use this code specifically for the initial 15-minute block of a session where continuous physician presence is required for patient monitoring and intervention.
Common Pitfalls
- Billing G800 when you are actually outside the chamber, which is a misclassification that should be billed under G804 or G805 instead.
- Failing to record exact start and stop times in the patient chart, which leads to automatic rejection or clawbacks during audits.
- Billing G800 for ISSHL cases without documented proof of prior Otolaryngologist confirmation or concurrent corticosteroid therapy.
Billing Tips
- Ensure your documentation explicitly states 'physician inside chamber' to justify the higher fee associated with G800 compared to external supervision codes.
- For sessions exceeding 15 minutes, use G800 for the first unit and G801 for subsequent 15-minute increments to maintain accurate time-based billing.
Effective: April 1, 2025
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Procedure
Diagnostic and Therapeutic Procedures
The start and stop times of the service must be recorded in each patient's permanent medical record. Per , if the patient's permanent medical record or chart does not include this required information, the service is not eligible for payment.
HBOT is insured only for the treatment of those internationally recognized indications approved by the ministry.
HBOT is only eligible for payment for idiopathic sudden sensorineural hearing loss (ISSHL) when the following conditions are met: a. The patient is treated concurrently with corticosteroid unless corticosteroids are contraindicated; b. The treatment is initiated within 30 days of a diagnosis of ISSHL; and c. The diagnosis of ISSHL is made or confirmed by an Otolaryngologist prior to the initiation of treatment.
HBOT is only eligible for payment for avascular necrosis (AVN) of bone following diagnostic imaging confirmation of symptomatic early to mid-stage AVN, e.g. Ficat stage I, II, or III or equivalent.
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