Medicare Medicare is a social insurance program administered by the United States government, providing health insurance coverage to people who are aged 65 and over, or who meet other special criteria. The program also funds residency training programs for the vast majority of physicians in the United States. Medicare operates as a single-payer health care system. The original Medicare program has two parts: Part A (Hospital Insurance), and Part B (Medical Insurance).It also has Medicare Part D that provides more comprehensive drug coverage and Medicare Advantage plans, also known as Medicare Part C, are another way for beneficiaries to receive Part A, B and D benefits. Medicare offers different kinds of preventive services. Please try to contact Medicare Customer Service directly prior to posting any complaints on this site.