I have a couple of medical ca. i originally sent out pfd's instead of dv for the accounts. The ca thought these were dv requests, and sent me a bunch of billing statements. some from the oc on hospital letterhead and some printed up on their letterhead. i've already called the hospitals to see if i could pay them directly, and they told me that i had to contact the ca and that i couldn't pay them. i sent the dv and received hospital invoices, and listings of all the medical procedures and tests that i had perfomed (from both ca's). i then faxed a pfd to one of the ca's and got back a letter telling me that i had to call them to discuss payment situations. is there anything else i can do or what other letter should i send them in this situation. these charges are co-payments and other miscilaneous charges that my insurance refused to pay. i think some insurance companies limit the amount of money that they are willing to pay for certain services. so, i guess i'm stuck with the fees, anyways, what further action can i take?