OHIP Billing Guide🩺 ServicePublished 2026
A283

A283 OHIP Billing Code: Medical Specific Assessment for Pathologists

Understand how to correctly bill OHIP for A283, specifically for medical specific assessments in the field of pathology. Ensure compliance with billing frequency and documentation requirements.

For Ontario Physicians & Billing StaffOHIP Schedule of Benefits Reference82.50 CAD~3 min read

1What Is the A283 OHIP Code?

What is an A283 Medical Specific Assessment?

The A283 code represents a medical specific assessment conducted by specialists in the field of laboratory medicine, such as pathology. This service is billed when a comprehensive evaluation of a patient's specific presenting complaint is required, including a full history and detailed examination related to that complaint.

In the context of pathology, these assessments are often focused on specialized areas such as coagulation or transfusion medicine questions. Given the specialized nature of these assessments, they're intended for scenarios where the presenting problem necessitates such focused attention. It's common for these to be missed when there is a misinterpretation of the requirements or documentation isn't thoroughly completed.

2Related Codes

CodeNameFrequencyDescription
C283Medical specific assessmentSimilar frequency limitations apply, specific to hospital in-patient servicesIn-patient equivalent of A283.
A284Partial assessmentNo special frequency limit appliesUsed for assessments not meeting full A283 requirements.
A285ConsultationNo special frequency limit appliesMore comprehensive initial consultation.
A286Limited consultationNo special frequency limit appliesA less extensive consultation than A285.

3Eligibility Requirements

Eligibility for Billing A283

  • Specialist Requirement: The service must be rendered by a specialist in a place other than the patient's home.
  • Assessment Necessity: A full history and examination of the affected systems related to the presenting complaint are required.
  • Frequency Limitation: Limited to one per patient per physician per 12-month period unless:
    1. A second presentation with a clearly different diagnosis occurs.
    2. A second medical specific assessment occurs, at least 90 days apart, and involves a hospital admission.
  • Time Recording: Start and end times of the assessment must be recorded.

4What Your Clinical Note Must Show

1Time Documentation

The physician must document start and end times of the assessment in the patient's permanent medical record.

  • Record start time of service.
  • Record end time of service.
2Comprehensive History and Exam

Document a full history and examination of systems pertinent to the presenting complaint.

  • Detail the patient's presenting complaint.
  • Examine and document affected systems.
3Location of Service

Ensure service is rendered by a specialist outside of the patient’s home.

  • Confirm service location is compliant.

5Weak vs. Strong Note Examples

The strong note is successful because it thoroughly details the history, examination, and time documentation, meeting all billing requirements. The weak note lacks specific details and proper time documentation.

Weak Note

Patient assessed for bleeding issue. Conclusions drawn regarding management. No additional documentation.

Strong Note

Comprehensive assessment conducted for patient presenting with suspected coagulopathy.

  • Full history reviewed, including past medical history related to coagulation issues.
  • Detailed examination conducted of hematologic and relevant systems.
  • Documented time of service from 10:00 AM to 10:45 AM.

6Common Reasons This Code Is Missed

1
Incomplete Time Documentation
Physicians often forget to record start and end times, rendering the service non-payable.
2
Misunderstanding of Frequency Limits
Claims are denied when submitted outside of the allowable frequency limits.
3
Inadequate Documentation of Examination
Lack of detailed notes on the history and systems examined may lead to claim rejections.
Document A283 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 billing A283 under OHIP?
The fee for A283 is CAD 82.50 as per the OHIP schedule.
How often can I bill A283 for a patient?
You can bill A283 once per patient per year, with exceptions if a second unrelated diagnosis occurs or if certain conditions are met for a second hospital assessment.
What types of pathology cases qualify for A283 billing?
Cases such as coagulation or transfusion medicine issues that require a medical specific assessment would qualify.
If a patient returns with a new issue, can I bill A283 again?
Yes, if the issue is a clearly different diagnosis from the first, you can bill for a second assessment.
The patient was referred for a specific coagulation problem. Does A283 apply?
Yes, if the issue requires specialized evaluation and a medical specific assessment, A283 can be billed.
Can I bill A283 for an assessment conducted virtually?
Yes, A283 can be rendered virtually and billed under A283A, for video or telephone assessments.
Is time logging mandatory for A283 billing?
Yes, both start and end times must be recorded on the patient's chart for the service to be payable.
In a pathology context, what documentation should accompany the A283 claim?
Detailed history, examination details, and when applicable, specialty-specific diagnostic findings should be included.
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.
@2026 Empathia AI, Inc. All rights reserved.