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Medicare, established under Title XVIII as part of the Social Security Act of 1965, is the federal health care financing program that provides health insurance for the elderly, the disabled, and those with end-stage renal disease (ESRD). Generally, Medicare covers care that is reasonable, necessary, and related to a diagnosed illness or injury. Medicare currently has four programs, which provide a variety of services to its enrollees (beneficiaries). These programs include Part A for inpatient services, Part B for outpatient and physician services, Medicare Advantage for those services provided by private health plans, and Part D for those prescription drugs not covered under Parts A or B.

The Medicare program has evolved significantly since its inception, as a result of changes to the original statute. Originally, Medicare included Parts A and B and was available only to those above 65 years of age. The law was amended in 1972 to include those individuals entitled to disability benefits and in 1976 to include those with ESRD. The Medicare law was amended in 1997 as a result of the Balanced Budget Act to establish the Medicare + Choice program (Part C), which provides private health plan choices to beneficiaries. Additionally, as a result of the Medicare Prescription Drug, Improvement and Modernization Act of 2003, the Part D program was added to provide additional prescription drug benefits and to replace the Medicare + Choice program with Medicare Advantage.

Overview of the Medicare Programs

Medicare Part A

Medicare Part A is the portion of this program that pays for hospital, or inpatient, services. Covered services include inpatient hospital care, care at a skilled nursing facility, home health care, and hospice care. To receive these benefits, each person must meet certain eligibility qualifications. Most beneficiaries who receive coverage under Medicare Part A do not pay a premium, because the program is financed through payroll taxes that were deducted while beneficiaries were working. Part A is known as a fee-for-service benefit, whereby coverage is determined based on the services rendered by the health care provider.

Medicare Part B

The Medicare Part B program provides supplementary medical insurance to those electing to receive the benefit. There is a premium associated with this portion of the program, which is paid monthly by the beneficiary. Part B provides coverage for outpatient health services provided in local clinics or home health service organizations, as well as coverage for specific medical devices and equipment. Covered services include physician services, other outpatient care, drugs and biologicals, durable medical equipment, and preventive services (such as annual screenings). Services that are not covered by Part B include routine physicals, foot care, hearing aids or eyeglasses, dental care, and outpatient prescription drugs. Part B is also a fee-for-service program.

Medicare Advantage (Part C)

Formerly known as Medicare Part C or the Medicare + Choice program, Medicare Advantage is the Medicare program that allows beneficiaries to receive covered benefits through a private health plan. Specifically, if a person is enrolled in Medicare Advantage, there is no need to be enrolled in Medicare Parts A, B, or D. Medicare Advantage provides coverage of inpatient and outpatient services, in addition to prescription drug coverage, in one plan, which is administered by a variety of private health plans. Medicare Advantage is not a fee-for-service program.

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