I have paid all copays and just rec 'd a bill from a collection agency. I have never rec 'd anything in the mail before on this. I called the Dr offfice and they say it was because visits that are being billed didnt have a referral but I always had a referral and if they told me that I would have gotten XXXX. I have attached proof that my primary care physician did send referrals. I feel as though this is some sort of way for them to bill people almost 5 years later knowing they will pay or it will kill their credit. I am in the XXXX and will be forced to pay something that is not accurate almost 5 years after the services.