Why are my G codes being rejected?

Why are my G codes being rejected?

MOH will automatically accept the first physician’s billing. If other physicians were involved in the patient’s care, their G-codes may be rejected unless supporting notes are submitted with the claim.

For emergency or critical care physicians, common rejection reasons include:

Exceeded Limits

  • A maximum of 3 physicians can bill G521 for the same patient on the same day.
  • If you are the 4th physician, you must bill G395 instead.

Exceeded Time Limits

  • G395 and G391 have strict time limits. If you bill more units than allowed, the entire claim line may be rejected. Exceeding 9 units of G391 will result in a rejection.

Premium Codes: Resuscitation codes cannot be billed with certain special visit premiums or standard counselling codes.

No Admission Date: If resuscitation occurs during an inpatient stay or upon admission, the Admission Date must be included, or the claim will be automatically rejected.

  • To help prevent these rejections, you can easily add your notes directly in the Agent+ app: Open the claim and scroll down to “Manual Review.”
  • Select the applicable service code(s).
  • Choose “Add Document” and attach your notes.

Providing your notes at the time of billing helps MOH verify the services and can reduce delays in payment.

Life-Threatening Critical Care & Resuscitative Care

Life-Threatening Critical Care & Resuscitative Care
These are two types of critical care provided during emergency situations. Life-threatening critical care applies when a patient is critically ill or injured and has a serious impairment of one or more vital organs that may lead to organ failure.

Billing Codes: G521, G522, G523

Note: Up to 3 physicians can bill G521 for the same patient on the same day. If a 4th physician provides this service, they must bill G395 instead.

Resuscitative Care

Resuscitative care is provided in an emergency when the patient does not meet the criteria for life-threatening critical care but is still at risk of:

  • Loss of life
  • Loss of a limb
  • Requiring life-threatening critical care

Billing codes: G395, G391

Agent+ Portal

Agent+ Portal

If you have questions about your payments in addition to your app’s resolved folder you have access to our online portal, where you can view a digital copy of your Remittance Advice (RA) in an easy-to-read format.

Understanding your Agent+ RA

PARTIAL & NON-PAYMENTS: The Ministry of Health (MOH) has partially paid the fee service codes listed below. An explanatory error code has been provided.

MOH PAYMENT MODIFICATIONS: MOH has adjusted the payment amount for the fee service code listed below and has provided an explanatory code for the adjustment.

MOH ADJUSTMENTS: MOH has returned these claims on more than one remittance advice. The complete payment and adjustment history for each claim is displayed. This section will indicate whether there were any claw backs or returned RAI payments. Error codes 55/57 will typically appear in this section.

Provider Registration

Provider Registration

Effective April 1, 2026, the Ministry of Health moved to one submission process and is now only using electronic submissions.

Providers must now submit registration and update requests through the secure online portal for the following services: https://forms.mgcs.gov.on.ca/en/dataset/on00574

  • OHIP Billing Number registration
  • Health Care Group registration
  • Group membership and payment consent/authorization
  • Changes to address, banking, or group information
  • IVR participation applications Social Assistance Verification Portal PIN requests

Blue Cross Registration

IFH/Refugee Registration (Blue Cross)
These claims are not eligible for submission through the Ministry of Health (MOH). To submit these billings, physicians must register for a provider account and submit claims through the Blue Cross online portal. Once registered, physicians must provide their direct deposit information to receive payment. Blue Cross payments are issued directly to the physician after the claim has been processed.

Version Code Issues

Experiencing issues with version codes?
There is a 24 hr service provided by MOH that will allow you to retrieve new version codes. Please ask us for details on how to access your PIN.

Helpful Resources

Here are some helpful resources

Resources for Physicians: This includes information on OHIP billing policies and procedures (such as registration and billing number maintenance), OHIP payment requirements (including guidance on the Schedule of Benefits for Physician Services), and electronic business services (such as Medical Claims Electronic Data Transfer (MCEDT) and eSubmit).

EPC Billing Briefs: It offers guidance on a wide range of billing topics—from general areas such as assessments, consultations, and virtual care services to more specialized subjects like billing for postgraduate medical trainees and specific services, including fee codes for oncoplastic breast surgery and the use of the trauma premium.

OHIP INFOBulletins: These are official communication from the Ministry of Health that provide updates on payment, policy, program, and software changes. Physicians and billing staff can receive notifications of newly published INFOBulletins by subscribing to the ministry’s opt-in email service.