OHIP Billing Guide🩺 ServicePublished 2026
A341

OHIP Billing Code A341: Optimize Reimbursements for Complex Radiation Oncology Re-Assessments

A341 is essential for billing complex re-assessments in radiation oncology when detailed evaluation is required. It is billed by radiation oncologists in Ontario under specific circumstances.

For Ontario Physicians & Billing StaffOHIP Schedule of Benefits Reference83.40 CAD~3 min read

1What Is the A341 OHIP Code?

A341 is an OHIP billing code designated for complex medical specific re-assessments in radiation oncology. This code is used when a more in-depth re-assessment is necessitated by the patient's complex, obscure, or serious condition. In clinical practice, this often applies when a patient undergoing radical radiotherapy experiences significant adverse effects, or when re-irradiation considerations necessitate a detailed review of the patient's previous dose distributions versus potential systemic therapies.

Due to its specific use case, A341 is sometimes overlooked. Physicians might bill simpler re-assessment codes inadvertently, leading to reduced reimbursement due to code mismatch or insufficient documentation correlating with the code's criteria.

2Related Codes

CodeNameFrequencyDescription
A343Medical specific assessmentN/A$95.95 fee, part of the Radiation Oncology listings
C343Medical specific assessmentN/A$95.95 fee, for services provided in a hospital inpatient setting
A340Medical specific re-assessmentN/A$72.00 fee, a lower-level re-assessment code in Radiation Oncology
C341Complex medical specific re-assessmentN/A$83.40 fee, for hospital in-patient services

3Eligibility Requirements

To be eligible for billing under the A341 code, the following criteria must be met:

  • The re-assessment must address a medical condition of complexity, obscurity, or seriousness, distinguishing it from a standard re-assessment.
  • All components required for a medical specific re-assessment must also be included.
  • The physician must limit billing for A341 to no more than four occurrences per patient per 12-month period.

It is crucial that the duration of the assessment is recorded, noting both the start and end times in the patient's permanent medical record, to comply with the requirement that services are not payable without time documentation.

A341 can also be rendered virtually using video or telephone options, billed as A341A. For services provided to hospital in-patients, use C341 as the corresponding billing code.

4What Your Clinical Note Must Show

1Time Recording Requirement

Ensure that the time when the insured service started and ended is documented.

  • Record start time of the assessment.
  • Record end time of the assessment.

5Weak vs. Strong Note Examples

The strong note succeeds by detailing the patient’s complex condition and the rationale for the in-depth re-assessment, while also properly documenting the assessment time. The weak note fails to provide specific details or rationale justifying the use of the complex re-assessment code.

Weak Note

Patient assessed following treatment. Symptoms discussed.

Strong Note

Patient presented with significant toxicity post-radical radiotherapy. Complexities included severe mucositis and potential impact on quality of life.

Re-assessment included detailed review of prior dose distribution considering re-irradiation versus systemic therapy.

  • Assessment from 2:00 PM to 2:45 PM recorded in patient chart.

6Common Reasons This Code Is Missed

1
Documentation Lacks Complexity Justification
Physicians might overlook explicitly noting the complexities which differentiate this service from a standard re-assessment.
2
Failure to Record Start and End Times
Omitting detailed time records could lead to non-payable services under OHIP guidelines.
3
Exceeding Frequency Limit
Billing this code more than the permitted four times per patient annually without awareness of limits can result in claim rejections.
4
Misunderstanding Virtual Processing
Confusion about billing for virtual services can lead to misquoted codes or improper charges.
5
Substituting Similar Codes
Using a standard re-assessment code when a complex re-assessment is warranted may lead to reimbursement issues.
Document A341 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 billing fee for code A341 under OHIP?
The billing fee for A341 is CAD 83.40.
How often can A341 be billed for the same patient?
A341 can be billed up to four times per patient per physician in a 12-month period.
What specific scenarios in radiation oncology justify using A341?
A341 is justified during complex toxicity management in patients part-way through or post-radical radiotherapy.
Can A341 be billed for a patient receiving re-irradiation?
Yes, when evaluating re-irradiation versus systemic options requiring detailed prior dose review, A341 is applicable.
What complexity findings justify billing A341 over A340?
Significant treatment side effects or required detailed address of prior treatment schemes justify billing A341.
How should physicians record time to comply with A341 requirements?
Start and end times of the assessment must be recorded in the patient's permanent medical record.
Is A341 applicable when a patient presents with severe mucositis post-radiotherapy?
Yes, severe mucositis reflecting significant treatment toxicity qualifies for a complex re-assessment under A341.
How is A341 billed if rendered virtually?
When delivered virtually, A341 is billed as A341A under OHIP.
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.