On XXXX XXXX, 2015 my aunt ( XXXX ) had a follow-up appointment with her XXXX. She had been hospitalized and was currently in a XXXX. The XXXX wanted a XXXX. He faxed an order to the hospital office which was just next door and indeed walked us out to the front of the building and directed us to where we were to go. We went and had it done. XXXX and her supplementary insurance initially paid for it but then withdrew the payments because they said that she should have had the XXXX at the XXXX. Medicare told me verbally that she was not liable for the payment.The physician had received documentation from the rehab so he knew where she was staying. Now the hospital is sending her ongoing letters and indeed a Final notice demanding payment as well as threatening to turn it over to a collection agency and listing it as a bad debt which will be detrimental to her credit rating. I feel the XXXX and those with XXXX are targeted as more likely to comply. I am her power of attorney and we are not going to pay for the mistake of others. To make matters worse, on XXXX XXXX the XXXX was repeated at the rehab because the Physician notes were unclear. My aunt should not have to pay for the mistakes of the professionals.