Patient Portal; Pay Bill; Refer A Patient; facebook; linkedin; instagram; twitter; youtube; Useful Links. Procedure Prep; Patient Portal; Pay Bill; Refer A Patient; ... MNGI Digestive Health clinics, endoscopy centers and the corporate office are open: Monday - Thursday Fridays Saturdays & Sundays. 8:00 am - 5:00 pm 8:00 am - 4:00 pm.