I'm having a hard time following what you are saying. Aren't you stating you want to be a billing service, and bill for multiple drs from your location or from the dr's office? If from your location, that is what most of us are doing here. If you mean from the dr's office, I don't think that is very likely. Since you would basically be asking them to supply you with all the hardware and software to run your business. Maybe they are out there, but you probably won't meet them thru this forum.
Good luck
Michele