OHIP Billing Guide🩺 ServicePublished 2026
C445

C445 OHIP Billing Code: Guide for Medical Oncologists

C445 is used by oncologists for consultations with hospital in-patients. It helps establish direction for systemic therapy in complex cases.

For Ontario Physicians & Billing StaffOHIP Schedule of Benefits Reference183.40 CAD~3 min read

1What Is the C445 OHIP Code?

What is the C445 OHIP Billing Code?

The C445 code is designated for consultations conducted by oncologists for in-patients in hospitals in Ontario. This code is applicable when a medical oncologist is consulted to assess and set directions for systemic therapy, particularly in cases involving newly discovered malignancies, suspicious masses, or complications related to known cancers.

It’s essential for physicians to recognize that the setting dictates the specific code prefix—C445 for in-patients, A445 for outpatient equivalents, and W445 for long-term care facilities. Although these codes carry the same fee, the correct prefix must align with the treatment setting.

2Related Codes

CodeNameFrequencyDescription
A445A445 ConsultationAs C445 but for outpatientsConsultation for medical oncology in outpatient settings.
A446A446 Repeat consultationRepeat consultations following A445For follow-up consultations requiring reassessment after an initial consultation.
A845A845 Limited consultationLimited scope, following A445Consultations focused on limited patient issues requiring oncological insight.
C446C446 Repeat consultationRepeat consultations in hospital settingsFollow-up consultations for hospital in-patients after initial C445 consultation.

3Eligibility Requirements

Eligibility Requirements for C445

  • Virtual Delivery: C445 may be rendered virtually via video, billed as C445A. Consultations conducted over the telephone do not qualify as an eligible Comprehensive Virtual Care Service.
  • Frequency: A maximum of one consultation per two consecutive 12-month periods is allowed under the same physician, patient, and diagnosis. An exception exists for an additional consultation in a hospital or emergency setting if rendered more than 12 but less than 24 months after the first.
  • Unrelated Diagnosis: If a consultation involves a clearly unrelated diagnosis, it may be billed once every 12 months.

4What Your Clinical Note Must Show

1Documentation Requirements for C445

Ensure the following details are documented in the medical records to support billing C445:

  • Patient consent for the consultation.
  • Clear documentation of the medical necessity and complexity of the case.
  • Comprehensive consultation notes including assessment, diagnosis, and treatment direction.
  • Virtual consultation notes must indicate video participation.

5Weak vs. Strong Note Examples

The strong note succeeds by providing detailed patient assessments and specific recommendations, which supports medical necessity and billing compliance. The weak note fails due to lack of detail and specifics.

Weak Note

The patient was seen for a consultation regarding their cancer diagnosis.

Strong Note

Consultation conducted on [date] to assess a newly discovered malignancy in the patient admitted for [related/previous condition].

A comprehensive examination was conducted resulting in a recommendation for systemic therapy including [specific treatments].

Patient discussed via video call with consent documented onsite.

  • - Type of malignancy and stage documented.
  • - Clear mention of new complications or related conditions.
  • - Specific oncological recommendations provided.

6Common Reasons This Code Is Missed

1
Incorrect Code Prefix
Failure to use the correct prefix based on the treatment setting can lead to billing errors.
2
Misunderstanding Frequency Limits
Billing more frequently than allowed due to misunderstanding the defined service frequency.
3
Virtual Care Misuse
Inappropriate usage of video vs. phone consultations, misunderstanding virtual care eligibility.
Document C445 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 maximum billing frequency for C445?
You can bill C445 once every two 12-month periods per patient, per diagnosis, except under certain conditions permitting more frequent billing.
Can C445 consultations be conducted via telephone?
No, C445 consultations must be done via video if conducted virtually, as telephone consultations are not eligible.
What types of cases in oncology warrant a C445 consultation?
Cases involving newly discovered malignancies, suspicious masses, or known cancer complications in hospital settings qualify.
In what settings is C445 most typically used?
C445 is primarily used for hospital in-patients under the care of an oncologist.
What diagnosis justifies a second consultation within the two-year limit?
A clearly unrelated diagnosis allows for an additional consultation within the two-year period.
How does patient referral typically occur for a C445 consultation?
Usually through other hospital departments when managing complexities in cancer patients requiring systemic therapy direction.
What patient scenarios justify using C445 over other consult codes?
Hospitalized patients with newly identified or complex cancer situations needing precise systemic therapy direction.
What are common complications in cancer patients leading to C445 consultations?
Complications may include hospitalization due to tumor-related issues or treatment side effects.
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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