Which federal agency administers all parts of the Medicare program, except for public information and enrollment?

The Centers for Medicare and Medicaid Services (CMS) is the federal agency responsible for administering all parts of the Medicare program, except for public information and enrollment. This agency oversees multiple health programs, including Medicare, Medicaid, and the Children's Health Insurance Program (CHIP). It ensures that the Medicare program operates effectively and efficiently, overseeing the quality of services, managing the reimbursement rates to healthcare providers, and implementing the regulations established by federal law.

While the Social Security Administration does play a crucial role in the enrollment process for Medicare, they are not involved in the broader administration and regulatory aspects of the program. The Federal Insurance Administration is not a recognized agency in relation to Medicare, and the Health Resources and Services Administration focuses on improving access to health care services for people who are uninsured, isolated, or medically vulnerable rather than on Medicare administration. Thus, CMS is the correct and relevant agency responsible for the overall management of the Medicare program.