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L811
L811 – Y Chromosome
OHIP Dermatology Code — Laboratory Medicine · Schedule of Benefits
L811 is a service listed under the Laboratory Medicine subsection for cytogenetic analysis of the Y chromosome. It is a diagnostic test.
When to Use
- Use L811 specifically for the detection of Y-chromosome material in patients with suspected sex chromosome abnormalities or ambiguous genitalia.
- Select L811 when performing targeted cytogenetic analysis that is distinct from the broader karyotyping covered under L803.
Common Pitfalls
- Billing L811 in conjunction with L803 for the same patient on the same day often triggers a rejection for unbundling unless distinct medical necessity is documented.
- Submitting L811 for routine prenatal screening is inappropriate, as this code is intended for diagnostic cytogenetic investigation rather than general genetic testing.
Billing Tips
- Ensure the requisition clearly specifies the diagnostic indication for Y-chromosome analysis to support the claim if audited against L807 or L803.
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