OHIP Billing Guide🩺 ServicePublished 2026
A100

A100 OHIP Billing Code: Optimize Emergency Department Efficiency

The A100 billing code allows general/family physicians to efficiently bill for emergency department assessments in Ontario. Maximize your billing potential with this essential code.

For Ontario Physicians & Billing StaffOHIP Schedule of Benefits Reference78.95 CAD~4 min read

1What Is the A100 OHIP Code?

The A100 billing code refers to the service provided by general or family physicians during an emergency department assessment. It ensures appropriate remuneration for physicians handling emergency cases in a fast-paced environment. The assessment involves a thorough history and examination of the patient to determine the appropriate care pathway. This code is crucial in emergency department settings funded under an ED alternate funding arrangement. Physicians must note that no other service, including premiums, rendered by the same doctor to the same patient at the same visit is claimable under this code. Missing this service during an emergency department shift can result in significant loss of income for physicians, especially if not properly documented or if the hospital master number is omitted from the claim.

2Related Codes

CodeNameFrequencyDescription
A914GP focused practice comprehensive consultation by VideoConsultation as neededComprehensive video consultations for focused practices.
A006Repeat consultationRepeat consultations as necessaryFollow-up consultations for ongoing patient management.
A010GP focused practice consultation by VideoInitial video consultations per patient needInitial consultations facilitated via video for GP focused practices.
A011GP focused practice repeat consultation by VideoRepeat video consultations as necessarySubsequent video consultations for continued care.

3Eligibility Requirements

Eligibility Requirements

  • Code-Specific Rules: This code applies specifically to general or family physicians conducting assessments in an emergency department funded under an ED alternate funding arrangement (ED-AFA).
  • Service Limitations: No concurrent service (e.g., special visit premiums) by the same physician for the same patient during the same emergency visit is covered.
  • Submission Details: Ensure the inclusion of the hospital master number associated with the emergency department on the claim form.
  • Admission Assessment: If a patient assessed is subsequently admitted and the physician continues as the MRP, the A100 code covers the admission assessment.
  • Certification of Death: Requires completion by the physician if declared by another professional, using the relevant diagnostic code.

4What Your Clinical Note Must Show

1Documenting A100 Service

To claim the A100 code, maintain thorough records of the service period and details.

  • Record the start and end time of the assessment.
  • Document a full history including presenting complaint, family, and social history.
  • Include examinations and findings for all body systems assessed.
2Hospital Master Number

Include the hospital master number tied to the emergency department to validate the claim.

5Weak vs. Strong Note Examples

The strong note is successful because it details the comprehensive patient history, full physical examination, and includes the required time records and hospital master number—critical for OHIP claims.

Weak Note

Patient seen in ED, assessment done. No additional info regarding history or exam.

Strong Note

Comprehensive assessment performed in ED. Full patient history taken including presenting complaint, family medical history, social context, and current medications.

Physical examination covered cardiovascular, respiratory, and neurological systems.

  • Documented start and end time: 09:00 - 09:30
  • Hospital master number recorded correctly

6Common Reasons This Code Is Missed

1
Incomplete Documenting
Missing elements of the patient's full history or examination can invalidate the claim.
2
Omission of Hospital Master Number
Forgetting to include the hospital master number on the claim form results in rejection.
3
Concurrent Service Billing
Attempting to bill additional services during the same visit without separation can lead to denied claims.
Document A100 correctly — every time
Empathia's templates automatically structure your notes to capture every required element for audit-proof billing.

8Frequently Asked Questions

What is the fee for A100?
The A100 code has a flat fee of CAD 78.95.
Can A100 be billed alongside other services at the same visit?
No, other services or premiums by the same physician during the same emergency department visit are not eligible for payment with A100.
What qualifies a family physician to bill A100?
The assessment must be conducted in an emergency department funded under an ED-AFA, including a full history and systemic examination.
How does a family physician's role change if the patient is admitted?
If a patient is admitted and the family physician remains as the MRP, the emergency assessment acts as the admission assessment.
What should be included in the patient assessment?
A thorough patient assessment including full history, examination of all systems, and documentation of time spent.
How is the hospital master number used in A100 claims?
This number identifies the department where the service was rendered and must be included in claims for payment.
What should be done if the patient presents multiple complaints?
Each relevant system must be assessed and documented, but the A100 code covers the overall emergency assessment.
How do you handle billing if the patient has died in the ED?
If another certified professional declares the patient dead, the attending physician who completes the death certificate may bill under certification of death rules.
Disclaimer: This article is intended as a general educational resource for physicians and billing staff. It does not constitute billing advice or a definitive interpretation of the OHIP Schedule of Benefits. Always verify current billing codes, eligibility criteria, and documentation requirements directly against the official Schedule of Benefits or consult with a qualified medical billing specialist.
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