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L842
L842 – Anti-tissue antibodies, screening dilution, titration and interpretation
OHIP Dermatology Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
This service is for the screening dilution, titration, and interpretation of anti-tissue antibodies. It is intended to be claimed as an add-on to L817 (Anti-tissue antibodies and interpretation - per case).
When to Use
- Use L842 when a positive screening result for anti-tissue antibodies requires further titration to determine the specific antibody concentration.
- Apply this code when the clinical laboratory protocol necessitates a serial dilution process to quantify the antibody titer following the initial L817 screening.
Common Pitfalls
- Billing L842 as a standalone service without an accompanying L817 claim will result in an automatic rejection.
- Submitting L842 for routine screening tests that do not involve a titration step is considered an inappropriate use of the code and a potential audit risk.
Billing Tips
- Ensure your laboratory requisition explicitly documents the necessity for titration to support the claim if the account is flagged for review.
Provider Fee$8.70
Effective: April 1, 2026
Category
J. Diagnostic and Therapeutic Procedures
Subcategory
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Service Type
Diagnostic
Code Classes
Diagnostic and Therapeutic Procedures
Referral RequiredFrom: Physician, NursePractitioner, OralMaxillofacialSurgeon
- anti-tissue antibodies, screening dilution, titration and interpretation add
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