A federal grand jury in Miami returned an indictment Thursday charging a Key Largo man with submitting approximately $42 million in fraudulent health care claims to United Healthcare. According to allegations in the indictment, from April 2013 to March 2017, Bradley Jason Kantor, 49, owned and operated Mobile Diagnostic Imaging Inc., a purported medical clinic in Davie, Florida that provided antigen therapy and other allergen immunotherapy services, such as allergy testing and allergy shots, to commercial insurance beneficiaries, according to the U.S. Attorney Office. It is alleged that Kantor offered and paid kickbacks to co-conspirators to induce them to refer beneficiaries to MDI, so that MDI could bill commercial insurers for services that it never provided, according to the U.S. Attorneys Office.