All codes
L843
L843 – Special Microscopy of Tissues and Interpretation
OHIP Dermatology Code — Laboratory Medicine · Schedule of Benefits
Special microscopy of tissues including polarization, interference phase contrast, dark field, autofluorescence or other microscopy and interpretation.
When to Use
- Use L843 when performing specialized tissue analysis such as polarized light microscopy for amyloid detection or crystal identification in synovial fluid.
- Apply this code for autofluorescence examination of tissue samples where standard light microscopy is insufficient for diagnostic interpretation.
Common Pitfalls
- Billing L843 for routine light microscopy or standard histological staining, which are typically included in the global fee for the primary laboratory procedure.
- Submitting L843 without a specific diagnostic report detailing the findings of the specialized microscopy technique, which is required to justify the additional fee over standard pathology codes.
- Attempting to bill L843 in conjunction with L844 for the same specimen, as these are often considered mutually exclusive depending on the specific laboratory methodology employed.
Billing Tips
- Ensure the laboratory requisition or final pathology report explicitly documents the use of the specialized technique (e.g., polarization) to support the claim during an audit.
- Verify that the specific microscopy technique used is not already bundled into the primary diagnostic code for the tissue examination to avoid duplicate billing rejections.
Provider Fee$24.05
Specialist Fee$0.00
Surgical Assistant Fee$0.00
Anaesthetist Fee$0.00
Non-Anaesthetist Fee$0.00
Effective: April 1, 2025
Category
Diagnostic and Therapeutic Procedures
Subcategory
Laboratory Medicine
Service Type
Diagnostic
Code Classes
Diagnostic and Therapeutic Procedures
Referral RequiredFrom: Physician, NursePractitioner
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