OHIP Billing Guide🩺 ServicePublished 2026
C623

C623 OHIP Billing Code: Accurate Assessment for In-Patient Allergy and Immunology

C623 enables physicians to bill for specific medical assessments for hospital in-patients, focusing on immunologic issues. Ideal for allergists and immunologists.

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

1What Is the C623 OHIP Code?

C623 is a billing code used for medical specific assessments conducted by allergists and immunologists in a hospital in-patient setting. This assessment typically addresses one immunologic question during a patient's hospital stay, such as evaluating recurrent infection patterns that may require an immune workup before discharge.

Physicians utilize C623 to ensure in-depth analysis and appropriate management strategies in complex immunologic cases, where a thorough in-patient assessment is crucial for effective treatment planning.

A common challenge with C623 is ensuring compliance with virtual service restrictions as the code is only eligible for 'VIDEO ONLY' virtual care and can't be billed for telephone consultations.

2Related Codes

CodeNameFrequencyDescription
A623A623 Medical specific assessmentRefer to specialty listingUsed for medical specific assessments rendered outside hospital in-patient settings.
A621A621 Complex medical specific re-assessmentRefer to specialty listingCovers complex re-assessments within Clinical Immunology specialty.
A624A624 Medical specific re-assessmentRefer to specialty listingUsed for medical specific re-assessments under Clinical Immunology.
C621C621 Complex medical specific re-assessmentRefer to specialty listingFor complex re-assessments within an in-patient setting for Clinical Immunology.

3Eligibility Requirements

For eligibility under OHIP guidelines, C623 can be billed as C623A when the assessment is performed virtually through video conferencing, as per Appendix J, Section 1 for eligible comprehensive virtual care services. Note that virtual assessments via telephone are not eligible.

The service is rendered as A623 for equivalent assessments performed outside hospital in-patient settings.

4What Your Clinical Note Must Show

1Documentation Requirements

Ensure meticulous record-keeping as per OHIP mandates, detailing the nature and findings of the medical assessment.

  • Patient identification (name, health number)
  • Date of service
  • Location (hospital in-patient setting)
  • Clinical findings and relevant immunologic questions addressed
  • Assessment method (video if billed as C623A)

5Weak vs. Strong Note Examples

The strong note clearly documents the patient information, clinical findings, and specific immunologic considerations, ensuring comprehensive and compliant billing.

Weak Note

Patient assessed for recurrent infections.

Plan to conduct tests later.

Strong Note

Patient Mr. Smith, admitted with a history of recurrent infections. Performed a thorough immunologic assessment focusing on potential immune deficiencies.

Key findings included low IgG levels, suggestive of an immune workup requirement prior to discharge.

  • Patient admitted and seen on [date]
  • Assessment findings: [details]
  • Discussed potential immune deficiencies

6Common Reasons This Code Is Missed

1
Phone Virtual Assessments Billed
C623 assessments via phone do not qualify under virtual care services, leading to denial.
2
Incomplete Documentation
Lack of detailed clinical findings or immunologic focus in notes can result in denied claims.
3
Incorrect Code for Setting
C623 is mistakenly used instead of A623 for out-patient settings.
Document C623 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 C623?
The OHIP fee for C623 Medical Specific Assessment is CAD 95.95.
Can C623 be rendered via telephone?
No, C623 can only be billed for video-based virtual assessments, not via telephone.
When should an immunologist use C623?
An immunologist should use C623 during an in-patient assessment that involves addressing an immunologic issue, such as recurrent infections.
How does C623 differ from a re-assessment code?
C623 is for initial medical specific assessments, while A624 and C621 are used for re-assessments in clinical immunology.
What scenarios justify billing C623?
C623 can be billed when assessing a single focused immunologic concern like a recurrent infection pattern during a hospital stay.
Can a family physician refer a patient for a C623 assessment?
Yes, if a patient is admitted and requires specialized immunologic assessment during their stay.
Is C623 applicable to immune workup prior to patient discharge?
Yes, this code supports assessments to decide on immune workups before discharge for suitable cases.
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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