Mercy Surgical and Diagnostic Center (MSDC) is a free-standing ambulatory surgery and diagnostic center operating in Merced since 1988.

The radiology department operates 3 mammography rooms, 2 general radiology rooms and 2 ultrasound rooms. All radiology technicians are licensed and the department is accredited by the American College of Radiology (ACR). Electrocardiograms (EKGs) are also available. The radiology department performs over 800 mammograms each month. A draw station is available in the facility for diagnostic laboratory studies.

The surgery department, which began operation in 1989, is accredited by the Accreditation Association of Ambulatory Health Care Inc. (AAAHC). There are 3 operating rooms and 1 procedure room available for a variety of surgical and non-surgical patients. A caring staff of Registered Nurses and Surgical Technologists provide top-notch quality care to approximately 200 patients a month who visit the department for procedures such as cataract extractions, breast biopsies, knee arthroscopies and hernia repairs. Because of the nature of ambulatory surgery centers, family members are an important part of care. Relatives are able to accompany the patient into the pre-operative room and are joined with the patient in the Post Anesthesia Care Unit following the procedure. A pain clinic also operates within the surgery department.