Pathology Professional vs Technical Component and Duplicate Lab Testing
An ASC sends a tissue specimen to an outside reference laboratory. The ASC's own pathologist reviews the slides and issues the final diagnostic report. The reference laboratory performed the specimen processing and slide preparation (technical component), while the ASC pathologist performed the professional interpretation (professional component). The reference lab bills the ASC for the technical component. Separately, the same patient had a CBC with differential drawn in the ASC preoperatively and sent to the reference lab, which performed and interpreted the test. The ASC is billing the insurer for the surgical procedure and asks the coder whether the ASC may also bill for the pathology professional interpretation and the CBC. The ASC has no in-house laboratory performing the CBC.
1. Determine how the surgical pathology service should be split between the ASC pathologist and the reference laboratory, and which modifiers apply.
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Surgical pathology has a professional component (PC) and a technical component (TC). When two different entities perform them:
- The reference laboratory bills the technical component using the surgical pathology code with modifier TC.
- The ASC pathologist bills the professional component using the same code with modifier 26.
The coder must ensure the same CPT code is used by both parties (e.g., the appropriate surgical pathology code for the specimen type and complexity), with each party billing only its component. Neither party may bill the global service. The ASC should not bill the global pathology code because it did not perform the technical component; the reference lab did.
Documentation must support the pathologist's interpretation (final report, slides reviewed). If the ASC pathologist both prepared and interpreted, the global code (no modifier) would apply - but that is not the case here.
2. Can the ASC bill the insurer for the CBC? Explain the correct handling.
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No. The ASC did not perform the CBC; the reference laboratory performed and interpreted it. The reference laboratory is the performing entity and should bill the CBC (globally, since it performed both technical and professional components) to the appropriate payer. The ASC cannot bill for a service it did not furnish.
If the ASC collected the specimen only, specimen collection may be separately reportable (e.g., a venipuncture code) if documented and payer-allowed, but the CBC itself belongs to the performing lab. Billing the CBC through the ASC would constitute billing for services not rendered and could create a duplicate claim if the reference lab also bills.
Key judgement: identify the performing entity for each service. The ASC bills only for services it actually furnished (the surgical procedure and any facility services it provided).
3. The coder notices the reference lab also submitted a claim to the same insurer for the CBC. What compliance issue arises, and what should the coder do?
Read the worked answer
If both the ASC and the reference lab bill the same insurer for the same CBC, that is duplicate billing - a compliance risk (potential false claim / improper payment). The coder should:
- Confirm which entity actually performed the test (the reference lab).
- Ensure the ASC does not submit a claim for the CBC.
- If a duplicate claim was already submitted, initiate correction (void/refund the improper claim) and document the correction per the compliance plan.
- Retain records showing the performing entity and the order.
This is a performing-entity and medical-necessity issue, not a coding-modifier issue. The coder's role is to prevent the improper claim before submission.