The Centers for Medicare & Medicaid Services (CMS) is a federal agency within the U.S. Department of Health and Human Services. It oversees the administration of the Medicare and Medicaid programs, which provide health coverage to millions of Americans, including seniors, low-income individuals, and people with disabilities. CMS also plays a role in regulating health insurance and ensuring quality care. In addition to managing these programs, CMS is involved in health policy research and data collection. The agency works to improve healthcare delivery and reduce costs through various initiatives, including the Affordable Care Act. CMS aims to enhance the overall health of the population while ensuring access to necessary services.