The Medicare program, providing hospital and medical insurance for Americans age 65 or older, was signed into law as an amendment to the Social Security Act of 1935. Some 19 million people enrolled in Medicare when it went into effect in 1966. In 1972, eligibility for the program was extended to Americans under 65 with certain disabilities and people of all ages with permanent kidney disease requiring dialysis or transplant. In December 2003, President George W. Bush signed into law the Medicare Modernization Act (MMA), which added outpatient prescription drug benefits to Medicare.
Medicare is funded entirely by the federal government and paid for in part through payroll taxes. Medicare is currently a source of controversy due to the enormous strain it puts on the federal budget. Throughout its history, the program also has been plagued by fraud–committed by patients, doctors and hospitals–that has cost taxpayers billions of dollars.
Medicaid, a state and federally funded program that offers health coverage to certain low-income people, was also signed into law by President Johnson on July 30, 1965, as an amendment to the Social Security Act.
In 1977, the Health Care Financing Administration (HCFA) was created to administer Medicare and work with state governments to administer Medicaid. HCFA, which was later renamed the Centers for Medicare & Medicaid Services (CMS), is part of the Department of Health and Human Services and is headquartered in Baltimore.
– History.com Staff