I did google this # and found it to be a landline from US LEC CORP in Pittsburgh. If I don't know the #, I don't answer, that's it in a nutshell. It might be Verizon or ATT.

Did a little more research....company profile is~~~~ US LEC Corp. Company Profile
Fast-growing CLEC (competitive local-exchange carrier) US LEC is lighting up switchboards across the eastern US. The company provides telecommunications services to about 26,000 midsized and large business customers, including high-usage entities such as hospitals and universities, in 16 states and Washington, DC. US LEC's company-owned switches are connected by leased fiber-optic lines; its voice and data offerings include local and long-distance phone service, Internet access, and an array of other data services. The company has agreed to combine operations with PAETEC, a private enterprise communications provider with similar operations that is headquartered in Fairport, New York.

They called and asked tons of medical questions regarding my wife's recent hospitalization. Totally not something a LEC corp should be doing.

This number leaves a message from your health team giving an 800 number to callback. Have no idea of what this is.

Got the call today - recorded greeting from "your health team", then asked to verify birth date.  Hung up and called the number.  Same recorded voice asking for DOB again. Hung up.