OHIP Billing Guide🩺 ServicePublished 2026
C341

C341 OHIP Billing Code: Unlocking Complex Re-Assessments in Radiation Oncology

C341 allows radiation oncologists to bill for complex medical re-assessments of in-patients facing serious or obscured conditions. This service is vital for adjusting and optimizing treatment plans.

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

1What Is the C341 OHIP Code?

The C341 billing code under OHIP is designed for radiation oncologists conducting complex medical specific re-assessments of hospital in-patients. This is particularly relevant when dealing with serious conditions such as palliative radiotherapy for cord compression or uncontrolled bleeding, or managing significant acute treatment toxicity. These situations demand thorough re-evaluation to effectively adjust the treatment plan and supportive care.

Complex re-assessments are distinguished from standard medical re-assessments by their focus on cases where the patient's condition presents unique complexities. Given the advanced needs of such patients, these re-assessments play a crucial role in ensuring optimal care. At times, not recognizing the need for a complex re-assessment can result in the application of a lesser code, potentially missing out on adequate compensation for extensive clinical effort.

The specialized context of radiation oncology reflects both the severity of the conditions treated and the precise adjustments required during treatment, often necessitating multiple reassessments within a year to adapt to the evolving clinical picture.

2Related Codes

CodeNameFrequencyDescription
A343Medical specific assessmentVariesMedical specific assessment in Radiation Oncology.
C343Medical specific assessmentVariesMedical specific assessment in Radiation Oncology.
A340Medical specific re-assessmentVariesMedical specific re-assessment in Radiation Oncology.
A341Complex medical specific re-assessmentVariesComplex medical specific re-assessment outside hospital in-patient settings.

3Eligibility Requirements

Eligibility for billing C341 involves providing non-emergency hospital in-patient services in radiation oncology. According to OHIP guidelines, these services are available for eligible patients under specific conditions, as defined in the Radiation Oncology listing.

The service must be a complex medical re-assessment due to the obscurity or seriousness of the patient's condition. Physicians are limited to four such re-assessments per patient per physician per calendar year. Additionally, these assessments can only be carried out virtually if done via video, as telephone service is not eligible under this code.

Frequent or inappropriate billing beyond the allowed limit will result in a reduced fee, so careful adherence to documentation and timing requirements is crucial.

4What Your Clinical Note Must Show

1Time Recording

Ensure that all time spent during the complex re-assessment is accurately recorded.

  • Record the start and end time of the service on the patient's permanent medical record.

5Weak vs. Strong Note Examples

The strong note succeeds because it provides detailed information on the patient's condition, the rationale for reassessment, the actions taken, and timestamps, all of which justify the use of the C341 code. In contrast, the weak note fails due to vague descriptions and lack of time documentation.

Weak Note

Re-assessed patient, no changes to treatment. Time not recorded.

Strong Note

Conducted a complex medical specific re-assessment due to significant acute treatment toxicity.

Treatment adjustments made to mitigate side effects.

Included detailed examination and consultation with multidisciplinary team.

  • Start Time: 14:00
  • End Time: 15:30
  • Recorded in the patient's medical chart.

6Common Reasons This Code Is Missed

1
Failure to Record Time
Not logging the start and end times can make the service non-billable.
2
Overuse beyond Allowed Frequency
Exceeding allowed reassessments results in reduced fee payables.
3
Incorrect Service Identification
Misidentifying a standard assessment as complex can lead to unjustified billing.
Document C341 correctly — every time
Empathia's templates automatically structure your notes to capture every required element for audit-proof billing.

8Frequently Asked Questions

How much is the fee for billing C341?
The fee for C341 is CAD 83.40.
Can C341 be billed more than four times a year per patient?
No, it is limited to four times per patient per year, per physician.
What medical scenarios typically require a complex re-assessment in radiation oncology?
Scenarios such as palliative radiotherapy for cord compression usually necessitate complex re-assessments.
What distinguishes a complex re-assessment from a regular one in this specialty?
Complex re-assessments are driven by severe or obscure patient conditions requiring intensive evaluation.
What patient scenarios justify billing C341 over A340?
In-patients experiencing acute treatment toxicity needing comprehensive evaluation justify C341.
How can an emergency call be billed alongside a complex re-assessment?
Use the General Listings and Premiums for emergency calls as per GP65 to GP78.
Can C341 be billed for telephone consultations?
No, C341 can only be billed for video consultations, not telephone.
What referral pattern typically precedes the use of C341 in radiation oncology?
Patients already admitted for palliative care or acute side effects are typical candidates.
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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