I have a PA and a physician from the same group seeing the same patient on the same day. The PA does the E/M portion and the physician does a facet joint injection. Can they be billed separately or should I bill under the physician both the E/M (with 25 mod) and the injection? Also, same goes with 2 PAs seeing the same patient on the same day for different injections. Is that billable? Would someone please direct me to a good resource for these instances? Thanks.