Did you know where the charges were coming out of prior to receiving the testing? If not, you can contact the insurance carrier, and see if an appeal might help. Is this an HMO? The provider, if they have not seen you in year really doesn't have any legal obligation to inform you of where they are sending the tests, however they should have seen your insurance information and had you check to see if they were in network. I'm assuming the physicians charges were covered from the 2011 visit?