We have a PA that does inpatient hospital billing, we have been using the the code sets of 99251-99255 for her intial visit and then 99231-99233 for the subsequent hospital care. She gets the referral to go see the patient, sees the patient, then calls the referring dr back with what she thinks should be the plan of action, to see if that is what the referring dr wants her to do, and then she does the treatment. My question is should she be billing the 99251-99255 for the first time she sees the patient or should she be billing the 99231-99232 code sets?