OHIP Billing Guide🩺 ServicePublished 2026
A343

A343 OHIP Billing Code: Essential Guide for Radiation Oncologists

A343 is designed for medical specific assessments performed by radiation oncologists, addressing new or worsening symptoms related to previous treatments.

For Ontario Physicians & Billing StaffOHIP Schedule of Benefits Reference95.95 CAD~3 min read

1What Is the A343 OHIP Code?

What is OHIP Billing Code A343?

A343 represents a medical specific assessment, primarily used by radiation oncologists for evaluating new symptoms in previously treated areas or new disease sites. This service involves a comprehensive history and detailed examination, focusing on specific regions affected by previous treatments.

Radiation oncologists apply A343 during in-office or outpatient clinic visits. These assessments are distinct from full consultations and typically follow up on specific patient complaints, ensuring focused evaluations without repeating exhaustive initial consultations.

2Related Codes

CodeNameFrequencyDescription
C343Medical specific assessmentOne or two per year depending on circumstancesHospital in-patient equivalent of A343.
A340Medical specific re-assessmentNo specific annual limit unless otherwise notedUsed for re-assessment in radiation oncology clinics.
A341Complex medical specific re-assessmentNo specific annual limit unless otherwise notedDetailed re-assessment addressing complex cases.
C341Complex medical specific re-assessmentNo specific annual limit unless otherwise notedFor complex cases in hospital settings.

3Eligibility Requirements

Eligibility Requirements for A343

To bill A343 under OHIP, physicians must conduct the assessment outside the patient's home. It requires a comprehensive history of the presenting complaint and a thorough examination of the relevant body parts or systems.

This assessment is limited to one per patient per physician annually, except in two circumstances:

  1. If the patient presents again with an unrelated diagnosis, the physician may bill a second assessment within that year.
  2. If at least 90 days have passed since the initial assessment and it coincides with a hospital admission assessment, a second assessment is allowed.

4What Your Clinical Note Must Show

1Time Recording

Ensure accurate documentation of the service duration.

  • Start time of the assessment
  • End time of the assessment
  • Permanent record of the timing in the patient chart

5Weak vs. Strong Note Examples

The strong note succeeds by detailing the presenting complaint, providing a comprehensive history, outlining specific examination findings, and recording the assessment time. The weak note lacks these details.

Weak Note

Patient assessed for new symptoms in treated area. Exam conducted.

Strong Note

Patient presented with new symptoms in the previously treated left thoracic field. Detailed history taken, covering onset, duration, and severity. Comprehensive examination conducted on the left thoracic area, findings consistent with radiation-induced changes.

  • Recorded start and end time: 14:00 - 14:30
  • Documented differential diagnosis considerations

6Common Reasons This Code Is Missed

1
Incomplete History
Failure to capture a comprehensive history of the presenting complaint can lead to missed billing opportunities.
2
Insufficient Exam Details
Not thoroughly examining and documenting the affected region or system may result in claim denial.
3
Frequency Limit Misunderstanding
Not understanding the frequency limits may lead to billing errors or denials.
4
Omitting Time Documentation
Not recording the start and end times of the service can invalidate the claim.
5
Inadequate Assessment Justification
Not clearly outlining the need for a specific assessment can lead to confusion and claim rejection.
Document A343 correctly — every time
Empathia's templates automatically structure your notes to capture every required element for audit-proof billing.

8Frequently Asked Questions

How often can A343 be billed per patient?
A343 can be billed once per patient per physician annually, or twice if conditions allow.
Is A343 eligible for virtual care billing?
Yes, A343 can be delivered virtually and billed as A343A under video or telephone services.
What types of patient cases often require a medical specific assessment in radiation oncology?
Patients presenting with new symptoms in previously irradiated fields or a new disease site often require this assessment.
Under what circumstances can a second A343 assessment be billed within 12 months?
A second assessment can be billed if the patient presents with an unrelated diagnosis or if 90 days have passed since the last assessment, coinciding with a hospital admission.
How does A343 differ from a full consultation?
A343 is focused on specific, newly arisen symptoms rather than a comprehensive initial consultation.
Can A343 be billed for follow-up after symptomatology in a previously treated field?
Yes, it is commonly billed for assessing symptoms in fields previously treated where new concerns have arisen.
What is required for accurate A343 billing in terms of documentation?
A comprehensive history, detailed examination notes, and service duration start/end times must be recorded.
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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