<prompt> Human: My daughter had blood-work done back in August of 2017 to check for a gene mutation. She also had a sweat test and we were billed for it and paid it. Now Im receiving a large bill from the hospital for January 2018 for the blood-work that was done. I called the insurance prior to this service and they told me a much lower amount due to the deductible being met. In fact, our out of pocket max was met as well since my twins were born in July 2017. How can they hold lab work for 4 months and then bill under a different date of service after my deductible reset? I did my due diligence by calling my insurance and asking if it was covered. Not knowing they would hold the lab work for 4 months. What do I do?  <response>: Deductible goes by Date Of Service, not billing date. If they used the wrong date of service, you should call and ask them to correct it. 