"Most persons aged 65 or older are automatically entitled to premium-free Part A because they or their spouses paid Medicare payroll taxes for at least 10 years. Persons under the age of 65 who receive cash disability benefits from Social Security for at least 24 months and individuals of any age with end-stage renal disease (ESRD) are also entitled to Medicare Part A. Eligible individuals who are not entitled to premium-free Part A may obtain coverage by paying a monthly premium."All persons entitled to Part A may enroll in Part B by paying a monthly premium ($135.50 in 2019). Some…

"Medicare spending is driven by a variety of factors, such as the level of enrollment, the complexity of medical services provided, health care inflation, and life expectancy. The Congressional Budget Office (CBO) estimates that total Medicare spending in 2019 will be about $772 billion; of this amount, about $749 billion will be spent on benefits."CBO estimates that the federal portion of Medicare spending (after deduction of beneficiary premiums and other offsetting receipts) will be close to $637 billion in 2019, accounting for about 14% of total federal spending and 3% of GDP. Over the next 10 years, Medicare spending is…

"The Medicare program has two separate trust funds—the Hospital Insurance (HI) Trust Fund, which finances Part A, and the Supplementary Medical Insurance (SMI) Trust Fund, which finances Parts B and D. (Part C payments are made in appropriate parts from both the HI and SMI Trust Funds.) Both funds are maintained by the Department of the Treasury and overseen by a Board of Trustees, which reports annually to Congress."Similar to Social Security, the HI portion of Medicare was designed to be self-supporting and is financed through dedicated sources of income. The primary source is payroll taxes paid by employees and…