OHIP Billing Guide🩺 ServicePublished 2026
A166

A166 OHIP Billing Code: Streamline Your Nephrology Repeat Consultations

A166 covers repeat consultations for nephrology, allowing follow-up on previously assessed kidney issues after interval care by another provider.

For Ontario Physicians & Billing StaffOHIP Schedule of Benefits Reference116.75 CAD~3 min read

1What Is the A166 OHIP Code?

What is A166?

A166 is a billing code for repeat consultations specific to nephrology in Ontario. It is used when a nephrologist sees a patient again for the same presenting problem after care from another physician, requiring a new written request.

Repeat consultations are crucial for managing chronic conditions like chronic kidney disease, especially when subsequent guidance is needed following interval management by another provider. Nephrologists often perform these consultations to adjust care plans based on updated lab results, such as increased creatinine levels.

Despite its importance, A166 can be overlooked because it requires meticulous tracking of previous consultations and new referral requests, which can easily be missed in busy practices.

2Related Codes

CodeNameFrequencyDescription
A160Comprehensive nephrology consultationLimited to appropriate use per patient needCovers extensive consultations requiring a full review.
A165ConsultationAs needed per specialist determinationFor standard nephrology consult visits.
A865Limited consultationSpecific to limited inquiries or follow-upsCovers brief consultations similar in fee to A166.
C160Comprehensive nephrology consultation (hospital in-patient)Applicable in hospital settingsFor in-depth consults within a hospital context.
C166Repeat consultation (hospital in-patient)Equivalent to A166 but within a hospital settingFor repeating consults in patient admissions.

3Eligibility Requirements

Eligibility Requirements for A166

  • Repeat Consultation Definition: A repeat consultation is required when the nephrologist sees the patient for the same issue after care by another physician, necessitating a new written request.
  • Written Request: A documented request from a referring physician, nurse practitioner, or dental surgeon must be retained in the nephrologist's medical records, except in institutional settings where common records are used.
  • Virtual Consultations: A166 can be billed for virtual services delivered via video, but not by telephone, aligning with Comprehensive Virtual Care Service guidelines.

4What Your Clinical Note Must Show

1Written Referral Documentation

Maintain a signed copy of the written request for consultation from the referring physician, nurse practitioner, or dental surgeon unless in a setting with common records like hospitals or multi-specialty clinics.

  • Ensure the request is dated and clearly states the consultation need.
  • Keep records organized and easily accessible for potential audits.

5Weak vs. Strong Note Examples

The strong note is effective due to detailed clinical context and clear referral documentation. The weak note lacks specificity in the patient's condition and the referral context.

Weak Note

Reviewed the patient's history of kidney issues. Follow-up recommended.

Strong Note

Conducted a thorough review of the patient's chronic kidney disease progression after receiving a referral due to elevated creatinine levels post-primary care management.

  • Documented comprehensive review: medical management changes and patient education for adjusted treatment regimen.
  • Included referring physician details and date of written request.

6Common Reasons This Code Is Missed

1
Missing Written Request
Failure to retain the new written request in the patient's record can lead to billing disputes.
2
Misidentifying Consultation Type
Confusing a repeat consultation with a general follow-up could result in incorrect billing.
3
Lack of Interval Care Documentation
Inadequate documentation of care between consultations may cause confusion over the eligibility for A166.
4
Virtual Eligibility Misunderstanding
Attempting to bill for a telephone consultation under A166, which is permissible only via video.
5
Overlap with Initial Consultation
Failing to distinguish between an initial consultation and a repeat consultation can lead to billing errors.
Document A166 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 A166?
The fee for A166 is CAD 116.75, which is a flat fee for repeat consultations.
Can A166 be billed more than once in a year?
Yes, A166 can be repeated as each requires a new written request and is not subject to the frequency limits.
Why might nephrologists frequently use A166?
Nephrologists may often need repeat consultations to manage chronic kidney disease following earlier interventions by other healthcare providers.
When might a nephrologist bill A166 over A165?
A nephrologist would bill A166 when seeing a patient again for the same kidney issue after interval care by another provider, not for initial consultations.
What should be documented for a repeat consultation involving chronic kidney disease?
Nephrologists should document the interval change in kidney function, like creatinine levels, and the management adapted due to those changes.
How is A166 billed for virtual consultations?
A166 can be billed virtually when delivered via video — phone consultations are not covered.
Under what conditions is A166 applicable in a hospital setting?
A166 is not directly applicable in hospitals; use C166 for in-patient repeat consultations at a hospital.
What scenarios do not qualify for A166 billing?
Follow-ups that do not have documented interim care by another physician or lack a new referral do not qualify as repeat consultations for A166.
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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