We are a mid-size pediatrics office with our own billing and collections office as well, we are wanting to know the laws about asking for a copy of the Driver's License when they check in or pay with check or even filling out new forms xan we legal ask them. the Driver's is to help us get payment from them ?

Can we do this

You should probably post this in the Business Law forum elsewhere on this site. This has nothing to do with employment law that I can see. You're talking about your customers, not your employees, right?