The error message, "Payer does not accept attachments" is very misleading. When I see this message, I am inclined to think there was a problem with Dentrix sending the attachments or with the Clearinghouse. If the problem is that Dentrix does not recognize the Payer ID, then the message should state that Dentrix does not recognize this payer ID, please check the Dentrix website or payer ID list within Dentrix to find the compatible ID for this payer.