1What Is the C233 OHIP Code?
What is C233?
C233 is an OHIP billing code used by ophthalmologists for the specific assessment of non-emergency hospital in-patients. This assessment involves a thorough history and examination related to a specific ophthalmological problem such as suspected endophthalmitis or ocular findings in systemic diseases. It is critical for accurate diagnosis and patient management. Often, this code is underutilized or missed because of misunderstandings about the frequency limits or documentation requirements.
Ophthalmologists must ensure detailed documentation of the patient’s presenting complaint and the examination of the specific eye condition. Missing or inaccurate documentation can lead to billing rejections or adjustments.
2Related Codes
| Code | Name | Frequency | Description |
|---|---|---|---|
| A233 | Specific assessment | Once per 12 months or twice if criteria met | Same service outside hospital in-patient settings. |
| C234 | Specific re-assessment | As needed, for follow-up | Follow-up assessment of in-patients. |
| A234 | Partial assessment | As needed | Limited assessment, less comprehensive than C233. |
| A935 | Special surgical consultation | As needed | Comprehensive consultation for surgical consideration. |
3Eligibility Requirements
Eligibility Criteria for C233
C233 covers specific assessments performed by a specialist ophthalmologist in a non-emergency hospital setting. The frequency limit is one assessment per patient per physician within a 12-month period. A second assessment within the same period is permissible only if:
- The patient returns with a new, unrelated diagnosis, or
- At least 90 days have elapsed since the initial assessment, and the second visit constitutes a hospital admission assessment.
Virtual assessments can be billed using C233A if conducted via video; telephone consultations do not qualify. Ensure proper documentation of start and end times, and maintain accurate records for billing compliance.
4What Your Clinical Note Must Show
Ensure proper documentation of service times.
- Record start time
- Record end time
- Maintain accurate medical records
Document the patient's history and examination thoroughly.
- Full patient history
- Detailed examination findings
- Diagnosis and assessment notes
5Weak vs. Strong Note Examples
The strong note succeeds because it provides comprehensive documentation, specific findings, and an action plan, whereas the weak note lacks detail and specificity.
Patient presented with eye redness. Examined the eye and suspected infection.
Patient presented with redness and pain in the right eye, suspected endophthalmitis.
Conducted a detailed ocular examination including fundoscopic assessment.
- Detailed patient history covering systemic disease
- Specific findings related to ocular exam
- Diagnosis and detailed action plan
