**Medicare: A Comprehensive Overview** Medicare is a federal health insurance program in the United States, designed to provide coverage for individuals aged 65 and older, as well as younger people with disabilities, including those with End-Stage Renal Disease (ESRD) and Amyotrophic Lateral Sclerosis (ALS)[1][2]. Established in 1965 under the Social Security Administration, it is now administered by the Centers for Medicare and Medicaid Services (CMS)[1][7]. **History and Structure** Medicare was created to address the healthcare needs of older Americans and those with severe disabilities. Over time, it has expanded to include more individuals and services. The program is structured into four parts: Part A (Hospital Insurance), Part B (Medical Insurance), Part C (Medicare Advantage), and Part D (Prescription Drug Coverage)[1][3]. **Key Achievements and Current Status** Medicare has been instrumental in providing health insurance to millions of Americans. As of recent years, it covers over 66 million people, with more than 57 million being aged 65 and older[1][5]. The program is funded through a combination of payroll taxes, premiums, and general revenues[6]. Medicare has been pivotal in reducing healthcare costs for its beneficiaries, though it only covers about half of their healthcare expenses[1]. **Notable Aspects** - **Financial Impact**: Medicare spending is substantial, with billions of dollars allocated annually[1]. - **Technological Integration**: CMS contracts with private entities for services like claims processing, which integrates technology into the program's operations[7]. - **Expansion and Innovation**: Medicare continues to evolve, offering various plans and benefits to meet diverse healthcare needs[4]. In summary, Medicare is a critical U.S. healthcare program that has made significant strides in ensuring health coverage for vulnerable populations. Its continued growth and technological advancements underscore its importance in the healthcare landscape.