Final answer:
The Centers for Medicare and Medicaid Services (CMS) is the government organization responsible for administering the Medicare program.
Step-by-step explanation:
The government organization responsible for administering the Medicare program is the Centers for Medicare and Medicaid Services (CMS). Medicare, part of the Social Security Act of 1965, is a federal health insurance plan primarily for people over the age of 65 and for individuals with certain disabilities. While the Social Security Administration may help with some aspects related to Medicare, such as enrollment, it is CMS that actually operates and regulates the program itself. CMS is a federal agency within the Department of Health and Human Services (HHS). Other government-funded healthcare programs include Medicaid for those with very low incomes, the Veterans Health Administration, the Indian Health Service, and the Children's Health Insurance Program.