international sos using wisconsin physicians service as their fiscal intermediary partner). the signing of the national defense authorization act in january 2011 aligned tricare with the provisions of the 2010 patient protection and affordable care act, and led to the creation of tya. enrollment began on 1 may 2011. program administration the ultimate responsible organization for administration of tricare is the u.s. department of defense military health system, which organized the tricare management activity (tma). the tricare management activity contracts with several large health insurance corporations to provide claims processing, customer service and other administrative functions to the tricare program. basic structure currently, there are three regional managed care support contractors (mcscs), a medicare/tricare dual eligible fiscal intermediary contractor (tdefic), and a tricare pharmacy contractor, who administers both mail order pharmacy (tmop) and retail pharmacy (trrx) programs. in addition several administrative contractors provide quality management, auditing, and statistical services. dental insurance tma contracts and administers dental programs. united concordia dental – as tricare dental program (tdp) delta dental – as tricare retiree dental program (trdp) health insurance in 2004, tricare management activity re-aligned the previous twelve regions into three large regions, known as tricare north, tricare south, and tricare west. services in these regions are provided by: north – health net federal services, llc the north region includes connecticut, delaware, the district of columbia, illinois, indiana, kentucky, maine, maryland, massachusetts, michigan, new hampshire, new jersey, new york, north carolina, ohio, pennsylvania, rhode island, vermont, virginia, west virginia, wisconsin and portions of iowa (rock island arsenal area), missouri (st. louis area) and tennessee (ft. campbell area). south – humana military healthcare services, inc. the south region includes alabama, arkansas, florida, georgia, louisiana, mississippi, oklahoma, south carolina, tennessee (excluding the ft. campbell area) and texas (excluding the el paso area). west – united healthcare the west region includes alaska, arizona, california, colorado, hawaii, idaho, iowa (excluding rock island arsenal area), kansas, minnesota, missouri (except the st. louis area), montana, nebraska, nevada, new mexico, north dakota, oregon, south dakota, texas (the southwestern corner, including el paso), utah, washington and wyoming. if you have tricare insurance, and you or your loved one needs treatment for alcohol or drug abuse, you are eligible for coverage at a wide range of treatment programs. all medical claims are processed ("adjudicated") by the following claims processing sub-contractors: north, south and west – pgba, llc (a subsidiary of bluecross blueshield of south carolina) tricare overseas claims and tricare for life – wisconsin physicians service insurance corporation in 2009, the tricare overseas program contract consolidated the following: overseas enrollment tricare overseas claims processing three area tricare service center contracts tricare global remote overseas (tgro) tricare puerto rico prime in october 2009 international sos assistance, inc. was awarded the contract to provide comprehensive health care support services to the department of defense tricare overseas program. effective january 1, 2018 the tricare regions were consolidated into two large regions, tricare east and tricare west. services in these regions are provided by: east – humana military healthcare services, inc. the east region includes alabama, arkansas, connecticut, delaware, the district of columbia, florida, georgia, illinois, indiana, kentucky, louisiana, maine, maryland, massachusetts, michigan, mississippi new hampshire, new jersey, new york, north carolina, ohio, oklahoma, pennsylvania, rhode island, south carolina, tennessee, vermont, virginia, west virginia, wisconsin and portions of iowa (rock island arsenal area), missouri (st. louis area) and texas (excluding the el paso area).. west – health net federal services, llc the west region includes alaska, arizona, california, colorado, hawaii, idaho, iowa (excluding rock island arsenal area), kansas, minnesota, missouri (except the st. louis area), montana, nebraska, nevada, new mexico, north dakota, oregon, south dakota, texas (the southwestern corner, including el paso), utah, washington and wyoming.