Medicaid in the United States is a federal and state program that helps with medical costs for some people with limited income and resources. Medicaid also offers benefits not normally covered by Medicare, including nursing home care and personal care services. The Health Insurance Association of America describes Medicaid as 'a government insurance program for persons of all ages whose income and resources are insufficient to pay for health care.' Medicaid is the largest source of funding for medical and health-related services for people with low income in the United States, providing free health insurance to 74 million low-income and disabled people (23% of Americans) as of 2017. It is a means-tested program that is jointly funded by the state and federal governments and managed by the states, with each state currently having broad leeway to determine who is eligible for its implementation of the program. States are not required to participate in the program, although all have since 1982. Medicaid recipients must be U.S. citizens or qualified non-citizens, and may include low-income adults, their children, and people with certain disabilities. Poverty alone does not necessarily qualify someone for Medicaid. The Patient Protection and Affordable Care Act (PPACA) significantly expanded both eligibility for and federal funding of Medicaid. Under the law as written, all U.S. citizens and qualified non-citizens with income up to 133% of the poverty line, including adults without dependent children, would qualify for coverage in any state that participated in the Medicaid program. However, the Supreme Court of the United States ruled in National Federation of Independent Business v. Sebelius that states do not have to agree to this expansion in order to continue to receive previously established levels of Medicaid funding, and many states have chosen to continue with pre-ACA funding levels and eligibility standards. Research suggests that Medicaid improves recipients' financial security. However, the evidence is mixed regarding whether Medicaid actually improves health outcomes, although 'the best existing evidence says improves health'. Medicaid and Medicare are the two government sponsored medical insurance programs in the United States and are administered by the U.S. Centers for Medicare & Medicaid Services in Baltimore, Maryland. Beginning in the 1980s, many states received waivers from the federal government to create Medicaid managed care programs. Under managed care, Medicaid recipients are enrolled in a private health plan, which receives a fixed monthly premium from the state. The health plan is then responsible for providing for all or most of the recipient's healthcare needs. Today, all but a few states use managed care to provide coverage to a significant proportion of Medicaid enrollees. As of 2014, 26 states have contracts with managed care organizations (MCOs) to deliver long-term care for the elderly and individuals with disabilities. The states pay a monthly capitated rate per member to the MCOs that provide comprehensive care and accept the risk of managing total costs. Nationwide, roughly 80% of enrollees are enrolled in managed care plans. Core eligibility groups of poor children and parents are most likely to be enrolled in managed care, while the aged and disabled eligibility groups more often remain in traditional 'fee for service' Medicaid. Because the service level costs vary depending on the care and needs of the enrolled, a cost per person average is only a rough measure of actual cost of care. The annual cost of care will vary state to state depending on state approved Medicaid benefits, as well as the state specific care costs. 2008 average cost per senior was reported as $14,780 (in addition to Medicare), and a state by state listing was provided. In a 2010 national report for all age groups, the per enrolled average cost was calculated to $5,563 and a listing by state and by coverage age is provided. The Social Security Amendments of 1965 created Medicaid by adding Title XIX to the Social Security Act, 42 U.S.C. §§ 1396 et seq. Under the program, the federal government provides matching funds to states to enable them to provide medical assistance to residents who meet certain eligibility requirements. The objective is to help states provide medical assistance to residents whose incomes and resources are insufficient to meet the costs of necessary medical services. Medicaid serves as the nation's primary source of health insurance coverage for low-income populations. States are not required to participate. Those that do must comply with federal Medicaid laws under which each participating state administers its own Medicaid program, establishes eligibility standards, determines the scope and types of services it will cover, and sets the rate of payment. Benefits vary from state to state, and because someone qualifies for Medicaid in one state, it does not mean they will qualify in another. The federal Centers for Medicare and Medicaid Services (CMS) monitors the state-run programs and establishes requirements for service delivery, quality, funding, and eligibility standards.