That would have been quite a disaster if this error had not been noticed before you paid. I am sure this happens a lot with more common names. Having a step-by-step procedure in place will catch potential mistakes. Making sure an address, phone number, and age/birthdate of the patient matches before proceeding to make an appointment or paying for a service is a good start. I am currently dealing with a mistake that was made for an appointment for my son. I was emailed an invoice for $800 for a service I know my son did not have and on the date stated. This shows there are errors in the process or that the process was not followed.