This actually is a legitimate number for Regions Hospital Outpatient Services in St. Paul.  I just received a message from a nurse to advise me of the details of my mom's upcoming appointment (which was not a hoax - my mom's appointment is real).  The nurse left a callback number (different from this number, so yes the -7042 number may be an 'outgoing only' number) - I called her back on the number she gave, she answered, and we had a legit follow-up conversation on my mom's appointment.