Humana is one of the largest private health insurers in the U.S. with a focus on administering Medicare Advantage plans. The firm has built a niche specializing in government-sponsored programs, with nearly all its medical membership stemming from individual and group Medicare Advantage, Medicaid, and the military's Tricare program. The firm is also a leader in stand-alone prescription drug plans for seniors enrolled in traditional fee-for-service Medicare. Humana offers employer-based plans primarily for small businesses along with specialty insurance offerings such as dental, vision, and life. Beyond medical insurance, the company provides other healthcare services, including primary-care services and pharmacy benefit management.