Кто звонил с номера 9130000000

For me, it was University of Kansas Hospital.

I get many calls from this phone number, when I pick up the phone I just hear many beeps.
Very annoying

In my case, this call was a legitimate call from the University of Kansas Hospital.

This is a doctors office. My call was from Amy to confirm my appointment, and my doctor is affiliated with KU Med.

KU Medical Center verifying an appointment