Whether you need general information about Medicare or Medicaid, have specific questions, or want to apply for one of these programs, these are the best places to start on the Internet.
Centers for Medicare & Medicaid Services
This is the site of the U.S. federal agency that administers Medicare, Medicaid, and the Children's Health Insurance Program. This site has lots of research and statistical data about the Medicare program, who receives benefits, and how it is administered.
Center for Medicare Advocacy
This national, non-profit, nonpartisan group's website provides education, assistance and advocacy for seniors and the disabled in obtaining access to their health care options.