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L817
L817 – Anti-tissue antibodies and interpretation
OHIP Dermatology Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
This service covers the performance and interpretation of anti-tissue antibodies per case. An additional service, L842, may be added for screening dilution, titration, and interpretation.
When to Use
- Use L817 when ordering initial diagnostic testing for celiac disease or autoimmune hepatitis where anti-tissue antibody detection is the primary clinical objective.
- Use L817 as the base code when the lab report provides a qualitative or semi-quantitative result for tissue-specific antibodies.
Common Pitfalls
- Billing L817 alone when the clinical scenario requires a titration, as this results in under-billing the full diagnostic workup provided by the lab.
- Attempting to bill L817 in conjunction with other general immunology panels that do not specifically isolate anti-tissue antibody interpretation, leading to potential claim rejections for duplicate services.
Billing Tips
- Always append L842 to L817 when the laboratory report includes a titration or screening dilution to ensure you are compensated for the full scope of the diagnostic interpretation.
Provider Fee$6.20
Effective: April 1, 2026
Category
J. Diagnostic and Therapeutic Procedures
Subcategory
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Service Type
Laboratory
Code Classes
Diagnostic and Therapeutic Procedures
Referral RequiredFrom: Physician
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