Is payyourbill.apsmedbill a Scam?

I received a letter from payyourbill.apsmedbill.com regarding a "Final Notice / Collection Agency Referral" with my son's name and a bill. There was no information on what the doctor ordered or the date of service. When I called, they said they would not provide any details unless I verified my son's date of birth. I offered (not knowing at the time it may be a scam), and they said the date of service was my son's date of birth which I just gave to them.

They gave a random doctor's name who requested the lab, but that doctor's name was never around my son, and after further research, there is no doctor with this name in our state even. They are doing identity theft, and collecting money from people who do not know better. They need to be investigated, shut down, and the people who paid need to be reimbursed.