Sounds like it could be a phony ID card, it happens. In this case if the patient has not been seen, a phone call can be made to explain that benefits could not be verified and see if they give you anything else. If they give you more information that is not checking out, I'd probably call back the carrier and request to speak with someone in provider relations to find out where to go from there. They may advise you to send them a copy of the ID Card.