Bux-Mont Gastroenterology Associates. Nursing (Nurse Practitioner) • 2 Providers. 1107 Bethlehem Pike, Sellersville PA, 18960. Make an Appointment. (215) 257-3011. Telehealth services available. Bux-Mont Gastroenterology Associates is a medical group practice located in Sellersville, PA that specializes in Nursing (Nurse Practitioner)..