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L807
L807 – Smear for Sex Chromatin (Barr Body) or Neutrophil Drumsticks
OHIP Dermatology Code — Laboratory Medicine · Schedule of Benefits
The L807 service is a laboratory medicine procedure involving the preparation and microscopic examination of a smear for sex chromatin (Barr Body) or for neutrophil drumsticks. This cytogenetic test is used to help determine an individual's sex chromosome constitution.
When to Use
- Use L807 when performing a rapid, preliminary screening for sex chromosome abnormalities such as Klinefelter or Turner syndrome in a clinical setting where full karyotyping is not immediately available.
- Utilize this code when specifically investigating neutrophil drumsticks to assess X-chromosome inactivation patterns in patients with suspected chromosomal mosaicism.
Common Pitfalls
- Billing L807 in conjunction with L811 or L803 for the same specimen or patient encounter will trigger a rejection, as these are considered overlapping laboratory cytogenetic procedures.
- Attempting to append after-hours premiums or special visit premiums to this code is a common cause of claim rejection, as L807 is explicitly restricted from these additions.
Billing Tips
- Ensure the laboratory requisition clearly specifies the clinical indication for the Barr body or neutrophil drumstick analysis to justify the use of L807 over more comprehensive genetic testing codes.
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