TRICARE Transition Guide April 2, 2013 General, Managed Care Managed Care Services, UMVS, TRICARE, United Health Military and Veterans Services 0 On April 1, 2013, United Health Military & Veterans Services (UMVS) began providing managed care services to 2.9 million TRICARE beneficiaries in the 21 western states, including California. On that date, UMVS took over the contract previously held by TriWest. To help physicians understand the impact the transition will have on their practices, CMA has prepared a TRICARE Transition Guide. (members only; login required) Comments are closed.