Medicare is a national health insurance program in the United States that is run by the federal government. It is primarily intended for people who are 65 years of age or older, as well as for certain younger people with disabilities or end-stage renal disease (permanent kidney failure requiring dialysis or transplant).
Medicare is divided into four parts:
Medicare is financed by a combination of payroll taxes, premiums, and general revenue. Eligibility for Medicare is based on age, disability, or end-stage renal disease, and U.S. citizenship or legal permanent residency.