PT
Good afternoon!
By your question, I am not clear regarding the PT? Is the patient in PT for their shoulder? If they are in therapy for their shoulder and the physician performs an evaluation on that should then starts therapy during the same day, s/he would report 97001 for the Assessment, then 971** x X for each 15 minute increment in therapy.
However, if the shoulder is completely separate from the reason for the PT, then yes, they would report the E/M 9921* for established patient visit, then the 971**-25 x X units for each 15 minutes in therapy. The modifier is attached to the procedure or service, never the E/M.
I hope that you find this response helpful.
Mary