Check again to see if the services were from 2012 or 2013. The Affordable Care Act changed lots of things starting in 2013. Could it be that the $6000 was your copayment and deductible for your health insurance?. That is based on the type of insurance that you have and has to be paid before your benefits kick in. Lots of employers have increased deductibles and company's and the Affordable Care Act deductibles and coinsurance levels are pretty high as I recall.