Pathology and laboratory services are textbook surprise bills: the patient never meets the pathologist and has no say in which lab handles the specimen. The No Surprises Act treats them accordingly. Pathology and diagnostic services, including lab work, are “ancillary services,” so patients can’t be asked to waive their protections for them, and out-of-network payment disputes go to open negotiation and independent dispute resolution (IDR).
The challenge for pathology groups and labs isn’t eligibility. It’s economics.
When the protections apply
The protections cover services furnished in connection with a visit to an in-network hospital, hospital outpatient department, critical access hospital or ambulatory surgical center — for example, surgical pathology on a specimen taken during a procedure at an in-network hospital. Emergency-related lab work is protected as part of emergency services.
They generally don’t cover lab work ordered from a physician’s office, because offices aren’t among the covered facility types. State law may reach further, so check the state guides on our resources page.
Where a specimen travels — for instance, to an independent reference lab — it’s worth confirming case by case how the claim connects to the facility visit.
Why pathology and lab claims get underpaid
- Payment at or near the QPA on high-volume codes. This is the rate dispute IDR decides.
- Unit and quantity errors, such as specimens or blocks undercounted. These are coding fixes for a plan appeal or corrected claim.
- Bundling of services that should be paid separately — also an appeals issue, not an IDR one.
See how to handle out-of-network underpayments for routing each kind.
Making the numbers work
Pathology claims are often small individually, and every federal IDR dispute carries fees. That’s why strategy matters more here than almost anywhere:
- Batch. Federal IDR allows qualifying claims from the same provider, paid by the same plan, for the same or similar service, to be grouped subject to timing rules. Batching turns a hundred small gaps into one dispute.
- Rank payers by gap. Look at the difference between what each payer pays and what similar disputes award. Start where it’s widest.
- Pick code families deliberately. High-volume codes with a consistent underpayment are where batching pays off — common surgical pathology codes are the usual starting point.
- Don’t lose claims to the clock. At lab volume, the 30-business-day window to start open negotiation is the most expensive thing to miss.
Building the IDR offer
The IDR entity weighs the QPA together with the complexity of the service, the provider’s training and experience (subspecialty pathology expertise, for example), and the parties’ contracting history. It may not consider billed charges or Medicare rates. More on the QPA and the factors the IDR entity can use.
This guide is general information, not legal advice. Confirm current requirements at cms.gov/nosurprises.