Centers for Medicare and Medicaid Services. It is the national administering agency for the Medicare program. It also works with states to administer each state's Medicaid program. CMS also insures many of the most complicated patients. If a hospital performs well with their CMS patients, it is a good indication they will do well with less complicated patients.

The Centers for Disease Control and Prevention is a national public health agency.

A national patient survey used to understand hospital patient experience.