Did the PA bill under the PA's NPI number or under the physician's. I still think that this should be an established patient.
merry - your question was answered by the OP in the post immediately above yours. The answer made it clear that the OP has switched to a new billing entity. That would make the OP a new patient.
The PA's claims were billed out under the supervising physician at the original location. Now that he has moved they are billing the claims out under the new supervising physician/group NPI.
Doctor's are free to hire and pay whomever they want - to help them carry out their duties. The hireling may do the work, but if the doctor is the billing entity (doctor bills under his Type 2 NPI Number), then the patient belongs to the doctor - not to the hireling. That is, the patient is the patient of the doctor, not the patient of the hireling, even tho the hireling may have done the work. Think this through in terms of a nurse giving a flu shot: the patient is still considered the patient of the doctor, even though the nurse (the hireling) did the work.
In the case of the OP, she went from one Type 2 NPI Number (who gets paid) to a new Type 2 NPI Number (who gets paid). She went from one billing entity to another. In both instances the doctor was the billing entity, even though the work was done by a hireling. Thus, the OP is considered the patient of the new doctor / billing entity, not the patient of the hireling. If the new doctor had not seen the OP before, she would rightly be considered a new patient of his (as the supervising physician), regardless of who did the work.