FIGURE 3-1 Defense Enrollment Eligibility Reporting System (DEERS).

Although active duty readiness is a major focus of the MHS, ADSMs and their dependents are becoming an increasingly smaller percentage of the total beneficiary population. In 1999, ADSMs and their dependents represented 57 percent of the beneficiary population, and retirees and their dependents 43 percent. By 2010, the active duty population had shrunk to 43 percent, while the retiree population had grown to 57 percent. By 2015, estimates are that only 35 percent of beneficiaries will be ADSMs and their dependents, while 65 percent will be retirees and their dependents. Because older beneficiaries tend to utilize health care services more than do younger persons, this changing demographic is contributing to the evergrowing costs of military health care (Jansen, 2009). Figure 3-4 provides definitions of terms related to TRICARE and the uniformed services health care system.

Active Duty Service Members and Their Dependents

ADSMs generally receive medical care at military treatment facilities or field health stations. ADSMs are automatically enrolled in TRICARE Prime

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