Fax: (314) 782-2620. Hours: Monday-Friday: 8 a.m. - 4:30 p.m. Schedule Appointment. You don't often think about your doctor until you get sick. The physicians at Mercy Clinic Primary Care at Butler Hill in St. Louis, MO want to change that. Being well between visits is just as important. So we focus on education and answering your health care ....