This number is actually a call center number to help hospitals financially clear their patients prior to their visit. The number is valid. Sometimes when the system at the hospital is down or correct information wasn't received when the appointment was scheduled the call center will have limited information.
I did recently applied for a job with Conifer, but they only allowed one and one-half rings and hung up. I called the number back and got a bunch of run around recordings that the number could not be forwarded.... please try your call again.