Ancillary services are defined under the No Surprises Act to include care related to emergency medicine, anesthesiology, pathology, radiology, and neonatology; care provided by assistant surgeons, hospitalists, and intensivists; and diagnostic services (including radiology and laboratory services). This means these types of providers—or, in some instances, the providers that offer these types of care—can never ask a patient to sign a consent waiver to be balance billed for services covered by the No Surprises Act.