<prompt> Human: Back in March of 2015, I was hospitalized for some Respiratory Issues. A day later I was discharged and they told me everything was taken care of I had given them my insurance info when checking in, and I put it behind me.Now today; Got an 800 collections letter for that incident. Between then and now, Not once has the hospital contacted me via phone or mail or by any other method to inform me of a past-due bill of any sort. Because of this, Id assumed my insurance covered it. Unfortunately, I no longer have that insurance provider It was from work, and they switched to different provider last yearI have not changed address nor have I gotten a new phone number since then, so there is no reason to NOT have contacted me to begin with.EDIT: Holycrap This exploded... Itll take a while to go though everything but thanks for the responses!  <response>: Had the same thing happen to me and it destroyed my credit for a year. Didnt find out until I went to take out a loan and was denied for the first time ever. No phone call, no letter, no email, I received no notification at all from the medical facility I was treated at. I had 8 different bills from the hospital and different labs in collection. I had left the hospital believing I was all squared up with the bills and would have gladly paid the bills they put into collection had I known. So I wrote them a strongly worded email, they replied that they tried to call me once three months after the procedure and it happened to be the same month I switched to a new cellular provider and got a new number. I replied back Thats all the courtesy I get before you destroy my credit? One phone call three months after my procedure? I went on to explain about the very necessary loan I needed to take out which was denied because of them. I also may have suggested posting my story to their facebook page it was a medium sized community that the hospital was located in with bigger hospitals about 50 miles away, I knew they didnt want the negative publicity.Next month I checked my credit score and they removed all the collections. Credit score shot back up but it was still a year before it was back to where it was before this. Edit: Some words. Also I didnt pay a single penny for the accounts they put into collection. 