Mason Ridge Ambulatory Surgery Center / Gateway Endoscopy Center
12855 N. 40 Drive, Suite 150, South Tower
Saint Louis, MO 63141
Phone: 314-336-1130
Fax: 314-336-1136
After Hours Exchange: 855-224-7875
Hours Of Operation:
Monday: 6:00 AM - 3:00 PM
Tuesday: 6:00 AM - 3:00 PM
Wednesday: 6:00 AM - 3:00 PM
Thursday: 6:00 AM - 3:00 PM
Friday: 6:00 AM - 3:00 PM