Final answer:
The Department of the Treasury is responsible for collecting Medicare funds, which is accomplished through payroll taxes, beneficiary premiums, and general revenues.
Step-by-step explanation:
Medicare funds are collected by the Department of the Treasury. This is done primarily through a dedicated payroll tax, which finance the Hospital Insurance part of Medicare.
Other parts, such as Supplementary Medical Insurance, Medicare Advantage, and Part D prescription drug benefits are also funded through beneficiary premiums and general revenues.
The Social Security Administration is involved in collecting some of the payroll records that pertain to Medicare, but it is not the entity that collects the funds for Medicare.