OHIP Billing Guide🩺 ServicePublished 2026
C723

C723 OHIP Billing Code: Medical Specific Assessment for In-Patient Occupational Cases

The C723 billing code is for occupational medicine specialists conducting specific assessments in hospital in-patient settings. Ensure accurate billing by understanding code specifics.

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

1What Is the C723 OHIP Code?

What is C723?

C723 is an OHIP billing code designated for medical specific assessments conducted by occupational medicine specialists on hospital in-patients. This code is applicable when evaluating patients with potential work-related conditions, such as acute chemical exposure or inhalational injuries. These assessments are crucial in thoroughly understanding the patient's presenting complaint, conducting a detailed examination, and formulating or excluding a medical diagnosis.

The code is often missed due to misunderstandings about the distinct context where it can be billed, specifically its restriction to in-patient hospital settings and the necessity for a documented comprehensive history and physical examination.

2Related Codes

CodeNameFrequencyDescription
A723A723 Medical specific assessmentRefer to out-patient equivalent settings in Occupational Medicine.Out-patient equivalent of C723.
A721A721 Complex medical specific re-assessmentFor complex re-assessments in Occupational Medicine settings.Used for complex reassessments, different scenarios.
A724A724 Medical specific re-assessmentOccurs post an initial assessment in Occupational Medicine settings.Standard re-assessment following initial assessments.
C721C721 Complex medical specific re-assessmentApplicable for complex hospital-based re-assessments.Complex scenarios requiring re-assessment in hospital settings.

3Eligibility Requirements

Eligibility Requirements for C723

  • Setting: The assessment must be conducted in a hospital in-patient setting.
  • Frequency: Limited to one per patient per physician per 12-month period unless:
    1. A second, clearly different diagnosis is made, unrelated to the first within the same period.
    2. At least 90 days have elapsed since the last assessment, and the second is a hospital admission assessment.
  • Virtual Care: Can be billed as C723A if delivered via video only; telephone consultations are not eligible.
  • Documentation: Start and end times of the assessment are required in the patient's permanent medical record.

4What Your Clinical Note Must Show

1Documentation and Time Recording

Physicians must ensure complete documentation of the service rendered.

  • Record the detailed history and examination conducted.
  • Ensure start and end times are noted in the patient's medical record.
  • Include reasons for assessment related to the occupational context.

5Weak vs. Strong Note Examples

The strong note provides a detailed, context-specific overview linking the patient's occupational history with the clinical findings, whereas the weak note lacks specificity and depth.

Weak Note

Assessed patient. Evaluation of exposure symptoms. Follow-up as needed.

Strong Note

Comprehensive specific assessment conducted on patient admitted with suspected chemical exposure. Detailed history included exposure type, timing, symptoms, and work-related context. Thorough examination of respiratory and dermatological systems undertaken.

Developed differential diagnosis considering occupational illness, planned follow-up assessments, and coordination with workplace safety protocols.

  • Clear delineation of assessment findings
  • Occupational context and injury linkage
  • Comprehensive history and physical examination details

6Common Reasons This Code Is Missed

1
Understanding In-Patient Context
Physicians often overlook that C723 is exclusively for in-patient hospital services, leading to inappropriate billing.
2
Documentation Incompleteness
Failure to document start and end times as required invalidates the billing process.
3
Misinterpretation of Frequency Limits
Misunderstanding of the annual limit and conditions for exceptions results in billing errors.
Document C723 correctly — every time
Empathia's templates automatically structure your notes to capture every required element for audit-proof billing.

8Frequently Asked Questions

How often can C723 be billed for the same patient?
C723 can be billed once per 12 months, with possible exceptions for different diagnoses or time elapsed with hospital admission.
Can C723 be delivered virtually?
Yes, but only through video consultations. Telephone consultations do not qualify.
What types of cases typically require a C723 assessment?
Cases involving acute occupational exposures, such as chemical inhalations or similar workplace-related injuries.
In an occupational medicine context, why use C723 instead of a general assessment?
C723 is specifically used for in-depth evaluations in hospital settings requiring specialized focus on occupational origins.
Why might an occupational medicine assessment be necessary in a hospital setting?
For conditions like acute chemical exposure needing specialized hospital-based evaluation.
What should be included in the documentation for a C723 assessment?
A complete history and examination, including the start and end times of the service.
Can a medical specific assessment be used for follow-up evaluations?
No, C723 is for initial specific assessments unless criteria for re-assessment are met.
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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