My wife went to a hospital when she was pregnant for tests 3 years ago. One of the test was done by a sonogram facility in the hospital and I did not know that they were seperate from the hospital. The hospital got apid no problem and I didn't fill out any paperwork for the sonogram place. The sonogram place never billed me for over two years and I wasn't expecting a bill because i didn't know they were seperate. Now two years later, collectionagency wants me to pay the bill. Hospital says it will try later and apologizes for not sending me a bill or having my correct address on file. Another year collection agency wants payment and it is too late for insurance to pay. If I had known they were seperate or got a timely invoice I could have had insurance cover it, what do I do?