I need advice for this situation. our Nurse Practitioner saw a new patient, he was diagnosed with right elbow bursitis. NP referred him to ortho for aspiration. pt could not get in that same day, so our MD told pt to come back in the afternoon and he would aspirate the bursa.

the Nurse Practitioner charged New Patient E/M for the morning appt, MD wants to charge for Established Patient E/M and the aspiration for the afternoon. my question is can this be done? or should we just bill for the procedure in the afternoon and the Office visit in the morning. can i use modifier 57 for the afternoon E/M?

any advice will be greatly appreciated
thanks