OHIP Billing Guide🩺 ServicePublished 2026
C473

C473 OHIP Billing Code: Efficiently Manage In-Patient Respiratory Assessments

C473 allows respirologists to perform and bill for medical specific assessments of hospital in-patients, addressing complex respiratory conditions.

For Ontario Physicians & Billing StaffOHIP Schedule of Benefits Reference99.15 CAD~3 min read

1What Is the C473 OHIP Code?

C473 is an OHIP billing code used by respirologists to conduct medical specific assessments on hospital in-patients. This assessment involves a thorough history and detailed examination to diagnose or manage respiratory conditions such as pleural effusions, pulmonary nodules, or unexplained hypoxaemia. The objective is to provide comprehensive care and expert evaluations.

A medical specific assessment in a respiratory context may be missed if a full history and examination are not documented or if the conditions for repeat assessment within the 12-month period are unclear. It's crucial for specialists to ensure precise documentation to meet the billing criteria.

2Related Codes

CodeNameFrequencyDescription
A473Medical specific assessmentSame conditions as C473Out-patient equivalent of C473 for respiratory disease assessments.
A471Complex medical specific re-assessmentRestrictions based on service complexity and diagnosis.Re-assessment in respiratory cases requiring more complex evaluations.
A474Medical specific re-assessmentAvailable for follow-up after an initial assessment.Follow-up assessments in respiratory disease management.
C471Complex medical specific re-assessmentUp to two re-assessments per year, subject to complexity and diagnosis.Complex re-assessment in in-patient respiratory cases.

3Eligibility Requirements

Eligibility for billing C473 involves the following criteria:

  • Service Setting: Must be conducted as a non-emergency hospital in-patient service.
  • Frequency Limitation: Limited to one specific assessment per patient per physician per 12-month period unless the patient requires a second assessment due to a different diagnosis or a hospital admission after 90 days.
  • Virtual Care: Eligible for virtual care delivery via video, but telephone consultation is not covered under this service code.
  • Documentation: The start and end time of the service must be recorded in the patient's permanent medical record.

Refer to General Preamble GP23 and GP48 for detailed documentation requirements.

4What Your Clinical Note Must Show

1Required Documentation

Ensure the following documentation is present:

  • Full history of the presenting complaint
  • Detailed examination findings of affected parts or systems
  • Diagnosis and management plan
  • Start and end times of the assessment service

5Weak vs. Strong Note Examples

The strong note details the clinical findings and plan, providing timeframes, whereas the weak note lacks specific details and timing.

Weak Note

Patient seen for evaluation. History and exam conducted. Assessment completed.

Strong Note

Patient presented with dyspnea and suspected pleural effusion. A comprehensive history was taken, including previous respiratory episodes and recent symptom development.

Physical examination indicated reduced breath sounds over the left lower lung field. Diagnosis of pleural effusion was made.

Plan includes further imaging and potential thoracentesis.

  • Start Time: 10:00 AM
  • End Time: 10:30 AM

6Common Reasons This Code Is Missed

1
Insufficient Documentation
Failure to document a full history or detailed examination can result in eligibility issues.
2
Misinterpretation of Frequency Limits
Not adhering to the restrictions on frequency of assessments can lead to incorrect billing.
3
Incorrect Service Setting
Billing for services delivered outside a hospital in-patient setting could result in denied claims.
Document C473 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 C473?
The fee for C473 is CAD 99.15.
What qualifies for a 'medical specific assessment' in respirology?
Conditions like pleural effusion, new pulmonary nodules, or unexplained hypoxaemia typically qualify.
Can C473 assessments be conducted via phone?
No, C473 assessments must be conducted via video when performed virtually.
What are typical referral sources for a C473 assessment?
Referrals often come from ER or other specialists when complex respiratory issues are identified.
How does the 12-month frequency limit work?
You can bill C473 once per year per patient per physician, with exceptions for different diagnoses or hospital admissions after 90 days.
Why might a new pulmonary nodule trigger a C473 assessment?
It requires specialist evaluation due to potential malignancy, necessitating detailed assessment.
What should I document if the second assessment involves hospital admission?
Record the elapsed time since the last assessment and ensure it's a hospital admission-related assessment.
Can respirologists bill C473 for out-patient settings?
No, C473 is specific to hospital in-patient services, use A473 for out-patient settings.
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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