They are a CAHPS survey vendor that was authorized by both the Center of Medicare & Medicaid Services and your Healthcare Provider to call you in regards to recent healthcare service. You are free to refuse the CAHPS survey and, by doing so, you won't be called again for at least 3 months.
As did I, and it IS a company that does survey's for the state and local government. Not only did they call, when they didn't get me, they called 12 more times! GOD.