The United States Government Accountability Office (GAO) has issued a report on the Defense Health Agency (DHA) handling of vetting TRICARE health care providers.  GAO found that DHA did not adequately vet health care providers and allowed disqualified persons to enroll in TRICARE provider networks.  To read the GAO report on DHA vetting of TRICARE health care providers, use the first link below.  To read GAO highlights of the report on DHA vetting of TRICARE health care providers, use the second link below.
https://www.gao.gov/assets/gao-24-106434.pdf  (GAO report on DHA vetting of TRICARE health care providers)
https://www.gao.gov/assets/gao-24-106434-highlights.pdf  (GAO highlights on DHA vetting of TRICARE health care providers)