There are three TRICARE geographical regions in the United States, each with its own TRICARE regional contractor that sets the terms and conditions for credentialing and certifying a provider for whatever level of participation the provider chooses. Real Warriors provides the tips and resources to navigate TRICARE and learn about provider types and the benefits of becoming a TRICARE-accepting physician.
Links:
[1] http://www.realwarriors.net/healthprofessionals/tricare/tricaredoctor.php