Fri 8:00am - 12:00pm. Sat Closed. Sun Closed. Make an Appointment. (828) 264-0029. Telehealth services availalble. Appalachian Gastroenterology (AppGastro) is a medical group practice located in Boone, NC that specializes in Physician Assistant (PA) and Gastroenterology, and is open 5 days per week. Providers Overview Location Reviews XX..