Call came in today, Dec. 7th 2015 at 3:15 PM and Caller ID displayed "Minneapolis MN 612-405-5378" and as usual, no VM was left. Since no VM was left, the call wasn't important to begin with.
Its a contracted service from United Health Care. I didn't answer because I didn't recognize the number but they left a message. They asked for me to call back to the member services number on the back of my insurance card for services available through United Health Care. Seems legit.