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Centers for Medicare and Medicaid Services

The Centers for Medicare and Medicaid Services (CMS) is the U.S. federal agency that works with state governments to manage the Medicare program, and administer Medicaid and the Children’s Health Insurance program. CMS offers many great resources for researchers who are looking for health data. For example:

  • CMS Statistics is a yearly reference booklet that people can download on the CMS website. It has summary information about health care expenses and use.
  • The Medicare and Medicaid Statistical Supplement has detailed statistics on Medicare, Medicaid, and other CMS programs. It has 115 tables and 67 charts that detail health expenditures for the entire U.S. population.1
  • Hospital Compare is an online tool created by CMS that helps users find information about the quality of care at over 4,000 Medicare-certified hospitals across the United States.
  • The CMS Data Navigator lets users search across all CMS programs using a menu-driven search application. Users can specify a particular type of data, or search for all available data types.


These questions ask you to find information from one or more of the resources at the CMS. You may find the answers by using charts, tables, graphs, or footnotes.

Using CMS Program Statistics select Explore Data, then select 2013, then Medicare Enrollment.


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