paula nelson isn't talking. but others certainly are. >> she needs to be shut down. >> now it's become principal. >> i feel like it's a scam. >> reporter: allegedly double billing at family dermatology. a chain of medical practices operated throughout the east by dr. paula nelson and her husband husband. >> i thought this has to be mistake. >> reporter: three years after ashley landis visit add family dermatology office in bucks county she received a bill from a collection agency for a whopping 551 bucks. >> i've never had to pay that much extra for going to a doctor or seeing a specialist. so that really raised a red flag for me. >> reporter: ashley says she always pays her co-pay immediately. and when she reached out to the collections company for more information, she couldn't get any. >> he said, if you don't pay this bill bite end of the day today, we are going to put this on your credit. >> reporter: stan snall neck kerr keeps getting bogus bills too. >> my insurance determined i do not owe any more than w

doctor paula nelson isn't talking but others certainly are. >> she need to be shut down. >> it is now principal. >> it is a scam. >> reporter: alleging double billing at family dermatology a chain of medical practices operated throughout the east, by doctor paula nelson and her husband. >> i thought that this has to be a mistake. >> reporter: three years after ashley landis visited a family dermatology office in bucks county she received a bill agency for a whooping $551. >> i have never had to pay that much extra for going to a doctor or seeing a specialist. so that really raised a red flag for me. >> reporter: ashley ace she always pays her co pay immediately. when she reached out to the collections company for more information, she could not get any. >> he said if you don't pay this bill by end of the day today we will put this on your credit. >> reporter: dan says he keeps getting bogus bills too. >> my insurance company is determining that i do not owe anymore than what i already paid. >> reporter: stan wrist ted a berks county family dermatology office in 2010. at least once a y