Paper superbill just as Jon says. If your biller wants it electronically, it's easy to take the stack of superbills at the end of the day that the docs have marked on, scan them to .pdf, and off they go.
That being said, I don't know how many people are in your office but billing is so easy to do. I do all of mine in house and I'm sure I have far more CPT codes and modifiers to use than most PCPs. I was stressed about doing it in the beginning because I was a bit clueless but, man, it's really saved me a lot of money and my collections are so much better. Days in A/R are non-existent. By the end of a clinic day for me, all of the charges have been entered and sent to the Clearinghouse. Takes my office manager an extra 30 minutes per day.
I know that wasn't your question but I think a lot of small practices delegate too much of the work they can do in house to companies who make money doing it for them.
