<prompt> Human: Hello reddit. Long time lurker. This is my first post. A dental office I havent been to since 2013 sent me a bill in February for over a grand. This month they sent a final notice letter with an attachment that states the billings department is under new management and they are evaluating all past account and that this is my true balance. I did have insurance at the time. I dont know what to do at this point. EDIT!!!Thank you for all the responses. I expected like maybe 10 replies but almost 200 comments and second page was way more than ever thought. It is a special thing when you have a community use their knowledge and experience to guide and help others with their issues. Thank you internets!I read most of your responses and tomorrow i will take action. Calling insurance to see what they say first. Also going to get the EOB and other important documents with charges faxed or emailed to me. If the money is owed i will call and work out a deal but 1,270 for two cleanings and one x-ray seems shady so i will check that.For those asking about the statements I called when i received the first one and was told they will look into it and give me a call back. They never did, and I never followed up. Didnt get a march statement. I got the april final notice with the correct name but a wrong hand written address on the envelope couple house numbers off which again makes me think they were trying to pull something. First step is to call the insurance. They seem like my only ally in this battle.I will try to post updates.  <response>: Make the office do all the work. This was a long time ago- youll need info about what was done, how it was billed, when it was sent to insurance, who the doctor was, etc.Why are you getting a final notice when you never even got a bill?The old management, you have no idea what their billing practices were - they sent a bill, you paid, you always pay your bills, and now this shows up. Confusing.Make them jump through hoops. Keep asking for information. Push comes to shove, ask then dentist what is going on 