OHIP Billing Guide🩺 ServicePublished 2026
C165

C165 OHIP Billing Code: Nephrology Consultations Made Easy

C165 is an OHIP billing code for nephrology consultations in hospital settings. It's essential for nephrologists managing acute conditions like kidney injury.

For Ontario Physicians & Billing StaffOHIP Schedule of Benefits Reference180.75 CAD~3 min read

1What Is the C165 OHIP Code?

C165 refers to a nephrology consultation service provided in a non-emergency hospital in-patient setting. This service, with a fee of CAD 180.75, is intended for situations where a nephrologist’s expertise is required to assess issues such as acute kidney injury, electrolyte imbalances, or the initiation of dialysis in hospitalized patients.

Often, C165 consultations are requested in the context of complex, serious, or obscured conditions where specialized nephrological advice is crucial. It requires a thorough review of the patient's condition and results in a comprehensive written report back to the referring healthcare provider.

Ensuring proper documentation and meeting eligibility requirements are critical to avoid denial of payment under this code. Common oversights include inadequate documentation of the consultation request and failing to adhere to billing frequency limits.

2Related Codes

CodeNameFrequencyDescription
A160A160 Comprehensive nephrology consultationOne per patient every 12 monthsComprehensive nephrology consultation for complex cases.
A165A165 ConsultationOne service per patient every 12 monthsOutpatient equivalent of the C165 service.
A166A166 Repeat consultationOnce every two consecutive 12-month periodsUsed for follow-up consultations when criteria met.
A865A865 Limited consultationAs clinically appropriate and justifiedLimited nephrology consultation for specific issues.

3Eligibility Requirements

For C165, consultations are permissible in a hospital setting and must adhere to specific frequency limits. Each consultation requires:

A written request for consultation from a referring physician, nurse practitioner, or dental surgeon, provided before the service. The request must be maintained in the medical record, detailing: the consultant's name and/or specialty, the referring professional's name and billing number, and the patient’s name and health number.

The conditions that must be met include:

  • One service per two consecutive 12-month periods for the same patient, physician, and diagnosis, except under specific inpatient or emergency conditions allowing two services in that time frame.
  • For different diagnoses, consultations can be billed once every 12 months.
  • In excess cases, reduced to the general or specific assessment rate.
  • Consultations rendered virtually are eligible for billing as C165A for video consultations exclusively, not for telephone-based services.

4What Your Clinical Note Must Show

1Consultation Request Documentation

Documentation must include comprehensive details about the consultation.

  • Written request from a qualified referring source prior to service
  • Retention of request in the consulting physician’s medical records
  • Identification of consultant, referring provider, and patient details
2Written Report Preparation

Document findings, opinions, and recommendations in a report returned to the referring provider.

  • Detailed report addressing consultation matters
  • Report copy submitted to the referring provider

5Weak vs. Strong Note Examples

The strong note succeeds because it provides comprehensive context and documents all required steps and communications, whereas the weak note lacks specificity and detailed documentation.

Weak Note

Patient seen for nephrology consultation. Report sent.

Strong Note

Detailed nephrology evaluation undertaken for acute kidney injury; comprehensive review conducted, including patient history assessment, clinical examination, and lab results analysis.

  • Consultation request documented from referring physician Dr. Smith.
  • Consultation findings and recommendations communicated in written report to Dr. Smith.

6Common Reasons This Code Is Missed

1
Insufficient Documentation
Incomplete records of consultation request or report, leading to denial.
2
Frequency Limit Exceeded
Billing for consultation past allowable frequency without justification.
3
Changes in Patient Diagnosis Not Noted
Failure to document new diagnosis when consulting again within frequency limits.
4
Telehealth Service Not Properly Identified
Attempting to bill telephone consultations under C165A incorrectly.
Document C165 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 C165?
The fee for a C165 consultation in nephrology is CAD 180.75.
How often can C165 be billed for the same diagnosis?
C165 can be billed once per two consecutive 12-month periods for the same diagnosis, with specific exceptions for inpatient or ED settings.
What types of nephrology issues typically require a C165 consult?
In nephrology, C165 consults are often for acute kidney injury, electrolyte disturbances, or dialysis initiation.
Who can request a C165 nephrology consultation?
Consultation requests can be made by a physician, nurse practitioner, or dental surgeon in connection with a hospital procedure.
Can a C165 consultation be done virtually?
Yes, but only through video conferencing, billed as C165A; telephone consultations are not covered.
In what patient scenario should a nephrology consultation C165 be billed?
C165 should be billed for hospitalized patients requiring a nephrologist’s expertise in acute situations, like acute kidney injury.
What documentation is required for billing C165?
A written consultation request and a detailed report of the consultation must be documented properly.
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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