The Centers for Medicare & Medicaid Services (CMS) is a federal agency within the U.S. Department of Health and Human Services. It oversees the nation's major healthcare programs, including Medicare, which provides health coverage for individuals aged 65 and older, and Medicaid, which offers assistance to low-income individuals and families. CMS plays a crucial role in ensuring that these programs operate effectively and efficiently. CMS also sets standards for healthcare providers and facilities, ensuring quality care for patients. The agency is responsible for implementing healthcare policies, managing enrollment, and overseeing the financial aspects of these programs. By doing so, CMS aims to improve access to healthcare services for millions of Americans.