<prompt> Human: We have PPO insurance. Ive received several medical bills lately that have confused me. The providers are all in network and no preapproval was necessary. They show the amount charged and the insurance payment and they bill me for the pro the insurance did not pay. If they have accepted the payment from the insurance company, shouldnt they write off the difference? Also, they dont take the copayment off the balance. Would it normally be deducted from the charges? Lastly, of these bills are incorrect, any tips on tackling this through the provider or insurance company?  <response>: It depends on what the difference constitutes. If the insurance settled the full amount for the smaller quantity, then no, you dont owe anything. If the insurance paid out for the partial amount but declined to cover a treatment or procedure, then yes you owe the difference. It depends. 