L846 – Flow cell cytometry and interpretation - per marker
OHIP Dermatology Code — DIAGNOSTIC AND THERAPEUTIC PROCEDURES · Schedule of Benefits
L846 covers the professional service of performing and interpreting flow cell cytometry, which is a technique used for cell counting, sorting, and biomarker detection. The fee is payable for each individual marker analyzed during the procedure, as listed in the Special Procedures and Interpretation - Histology or Cytology subsection of Laboratory Medicine ().
When to Use
- Use L846 to bill for each individual marker analyzed in flow cytometry panels, such as immunophenotyping for hematologic malignancies.
- Apply this code when the laboratory protocol requires specific marker quantification that exceeds the scope of general diagnostic codes like L837 or L838.
Common Pitfalls
- Billing L846 as a single global fee instead of per marker, which leads to significant underpayment.
- Submitting L846 for automated cell counts that are already bundled into global laboratory service fees rather than specific biomarker identification.
Billing Tips
- Ensure the total number of L846 units claimed matches the specific number of markers documented in the laboratory report to avoid audit discrepancies.
Effective: April 1, 2026
J. Diagnostic and Therapeutic Procedures
DIAGNOSTIC AND THERAPEUTIC PROCEDURES
Laboratory
Diagnostic and Therapeutic Procedures
All insured services must be documented in appropriate records that establish: 1. an insured service was provided; 2. the service for which the account is submitted is the service that was rendered; and 3. the service was medically necessary.
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