Mercy Clinics announced that it will open a new internal medicine clinic Aug. 1. on Mercy Medical Center – Des Moines’ Central Campus, 411 Laurel St., Suite A120. Dr. Michael Blaess and Dr. Carol Horner, along with two physician assistants and a diabetic educator, will see adult patients only at the new clinic. Providers currently practicing at the Family Medicine Central Campus have relocated to other Mercy Clinic locations where there has been an increased demand