XXXX XXXX XXXX sent my bill to CDI AFFILIATED services for {$51.00}. I have a co-pay every time I see the dr and that MUST be paid before I see the dr . They schedule extra services " after '' insurance is verified that I will not have an out of pocket expense. The Dr. changed insurance payment and I never received an invoice. I continue to see the Dr. and was never advised I had a past due amount. I called their office and they advised since the changed insurance payment carriers they have no record. I looked at all my EOB and there is not one statement that shows I might have an out of pocket expense. Why would I go to a dr. and not pay the amount I owe? This appeared on my credit with no notice, no letter, no phone call XXXX 2015. I only came to realize this when I attempted to refinance my house and was denied.