This number belongs to Radiology & Imaging Consultants out of Greeley, Colorado.  They are a debt collector working with the Memorial Hospital System in Colorado Springs, although I they might work with other hospitals too.  I got a call from them hounding me for payment (a total of $32!) only 2 weeks after I got the bill and before I had a chance to pay it!

I got calls from this number. They said I owed money for radiology, but refused to tell me what Dr or hospital was involved.

they call me 15 times a day when I do answer it is just a annoying buzz noise in my ear.

I have missed 3 calls from this number. They never leave a message. Who ever it is calls my cell phone late in the evening. I don't pick up calls I don't recognize and without knowing who it is I won't call them back in case it is a scam. Odd that there seems to be no record of who this 855 number belongs too. With all of the scams going on right now I'm wondering if this isn't one of them.