We have United Healthcare through Bonnie's work. Just for the record, it's not very good. I just wrote a check today for $69.00 to our doctor to cover the costs of the supposedly "free" yearly healthcare exam. It was for that part of the exam not covered by United Healthcare.Did you call your insurance company to see how they want you to proceed?Lots of doctors and lab companies pull this as a regular stunt and people fall for it. Many times (not saying this is absolutely true in your case) the insurance company will tell you to send them the bill for the overage and they'll take care of it (usually, I think, by telling the doctor/lab "you were contracted by us to cover our insured for that procedure for $xxx and you may not bill them for extra").Sometimes the insurance company will instruct you to pay the overage and then send proof of payment to them, and then they'll pay you back.And weirder still is the insurance company sending you a check for the amount and instructing you to pay it when you receive their check. Aetna recently pulled this one on me and it STILL doesn't make sense. And then... there's the times when every flipping charge except one for an event gets paid and the insurance company denies you ever had the service, medicine, procedure. Had that happen once, too. Oy, that was a mess.