Robert W. Halsted, MD 901 Patients First DriveWashington, MO, 63090Mercy Clinic Internal Medicine - Patients First Drive View Phone 636-239-7500 Fax: 636-239-2836 901 Patients First DriveWashington, MO 63090Mercy Clinic Internal Medicine - Patients First Drive View Website Experience & Reliability About Reservation Send to My Email Send to My Phone Print this Page