OHIP Billing Guide🩺 ServicePublished 2026
A623

A623 OHIP Billing Code: Streamlining Allergy & Immunology Assessments

A623 covers medical specific assessments in Allergy and Immunology, including virtual visits, ensuring efficient patient follow-up.

For Ontario Physicians & Billing StaffOHIP Schedule of Benefits Reference95.95 CAD~3 min read

1What Is the A623 OHIP Code?

The A623 billing code is used for medical specific assessments in the field of Allergy and Immunology. This code is applicable when a patient requires an evaluation for a particular allergic or immunologic condition. Typically, this assessment might involve reviewing a patient's response to allergy shots or monitoring asthma control, and does not require the comprehensive workup of an initial consult.

In clinical practice, this code prevents redundancy in billing for consultations that do not necessitate a full reevaluation. Many physicians overlook A623 because they assume a full assessment or repeated consultation is required, when a targeted follow-up would suffice.

This code enables streamlined care delivery, promoting focus on specific patient needs, aligning closely with follow-up visits where managing or reassessing an established treatment plan is needed.

2Related Codes

CodeNameFrequencyDescription
C623C623 Medical specific assessmentFollows the same specialty listing rulesUsed when the same service is rendered to a hospital in-patient.
A621A621 Complex medical specific re-assessmentSpecialty listingFor complex cases requiring detailed reassessment.
A624A624 Medical specific re-assessmentSpecialty listingUsed for re-assessments that are less complex than those billed under A621.
C621C621 Complex medical specific re-assessmentSpecialty listingUsed for complex reassessments of in-patients.

3Eligibility Requirements

A623 is eligible for use in both in-office and outpatient clinic settings in the domain of Allergy and Immunology. It can be billed as A623A for services rendered virtually, either through video or telephone. Services provided to hospital in-patients will use the corresponding C623 code. The eligibility for this billing code follows guidelines stated in the General Preamble assessment rules rather than an annual cap, ensuring that it aligns with specialty-specific service delivery models.

4What Your Clinical Note Must Show

1Virtual Service Documentation

Ensure documentation supports that the assessment occurred via video or telephone as per the A623A requirements.

  • Patient's consent for virtual care
  • Date and time of service
  • Specific platform used for the virtual consultation
2Assessment Details

Documentation must detail the specific immunological issue assessed and rationale for any treatment or follow-up changes.

  • Patient's current condition and symptoms
  • Treatment plan adjustments
  • Clinical rationale for selected interventions

5Weak vs. Strong Note Examples

The strong note succeeds because it provides specific details about the patient's condition, the treatment plan adjustments, and future care plan, whereas the weak note lacks specificity and depth.

Weak Note

Patient seen for follow-up. Discussed treatment.

Strong Note

Patient evaluated in follow-up for asthma management. Reviewed response to recent changes in immunotherapy regimen.

Action plan: Adjusted dosage based on symptom response and patient feedback.

Follow-up scheduled to reassess control and response in two months.

  • Asthma symptom review
  • Immunotherapy efficacy assessment
  • Consultation length and key discussion points

6Common Reasons This Code Is Missed

1
Misinterpretation of Code Scope
Some physicians mistakenly believe A623 requires a new consultation rather than ongoing management of a specific condition.
2
Overlooking Virtual Eligibility
Practitioners may not utilize virtual billing under A623A due to unfamiliarity with virtual assessment billing criteria.
3
Inadequate Documentation
Insufficient detail in clinical notes can prevent successful billing of A623, as it requires specific documentation of the immunologic problem and response evaluation.
Document A623 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 billing A623 under OHIP?
The fee for A623 is CAD 95.95, as listed in the Schedule of Benefits.
How do I bill A623 for virtual assessments?
For virtual assessments, you should bill using A623A, ensuring all virtual service documentation is completed.
Can A623 be used for general allergy consultations?
A623 is intended for follow-up assessments focused on specific allergic or immunological issues, not for initial or comprehensive consultations.
In which cases should I consider using A621 instead of A623?
Use A621 for complex cases that require a comprehensive reassessment of the patient's condition beyond a specific issue.
How often can I bill A623 for a single patient?
Billing frequency is determined by the assessment rules specific to your specialty, not a fixed annual cap.
What types of patient scenarios are appropriate for an A623 bill?
Appropriate scenarios include assessments focused on a specific issue, like verifying asthma control or assessing response to immunotherapy.
Is a referral required for billing A623 in Allergy and Immunology?
While not strictly necessary for billing, ensuring continuity of care through a referral may strengthen the clinical context and rationale for assessments.
Can I bill A623 alongside other procedures or assessments on the same day?
You should verify with current OHIP guidelines as combinatory billing may have specific restrictions or requirements.
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.