A patient calls his primary nurse practitioner because he is having abdominal pain and diarrhea. He speaks with his her for five minutes and after obtaining more signs and symptoms, the nurse practitioner suspects the patient is suffering from a gastrointestinal virus. The patient is recommended to proceed with supportive care, and if not improving in 48-72 hours, to follow up in the physician’s office. The patient improved, so did not have to follow up in the office. What is the correct CPT code for this type of telephone service?