<prompt> Human: My wife had outpatient surgery. The bill was 5k or so. We hadhave the money, but the hospital offered a 0 payment plan so we sent them 50month for roughly two years. Then a letter and a check show up saying that we overpaid our bill. By my calculations we still owed another 1k.nbsp;Two months go by and the hospital says the letter was a mistake and they added 1200 to what I thought the bill should be. I spent six months talking to customer reps who offered two explanations: 1. the bill was transferred between hospital departments; and 2. insurance belatedly decided not to pay for something so they added it to my bill. nbsp;I was never able to get any more information than this. Not what the insurance isnt paying, not which departments transfered the bill. Only, Ill have my supervisor look at this.nbsp;At some point the issue was elevated to a special office in the hospital that was supposed to review the bill. They reduced the bill by 150, but offered no explanation why.nbsp;That was four months 39 emails and phone messages ago. The hospital wont even return my calls anymore. Were still sending 50month. As I see it, all my options suck:1. Keep paying2. keep harassing the hospital3. try to get the insurance company to explain what happened4. stop paying and negotiate with the collection agency5. hire a medical billing advocatenbsp;Id appreciate any advice you guys have!  <response>: I agree with contacting insurance about the 1.2k, what its for, when it was submitted, and if they rejected it. Theres generally a 30-day time limit on when providers can submit bills to the insurer, and its possible the hospital failed to send some charges to the insurance company within that time frame and are trying to bill you their late claims. If the insurance company says they refused to pay the 1.2k when it was originally billed and the hospital is billing you the difference, then Id check your states laws on whether such balance billing is allowed. 