Question: What POS should we use when our physician does interpretations of sleep studies for various hospitals around our area? He is not actually at their location to do the interpretations -- can be at our office, at home, another hospital, etc. Hawaii Subscriber Answer: The location for the interpretation should match the location in which the testing was performed. The interpreting physician would report the same place of service in which the testing occurred (e.g., in an outpatient hospital setting, you should use the "22" code). The interpreting physician can report his/her service with modifier 26 under his corresponding NPI, and the facility would report the technical portion with modifier TC under their corresponding NPI.