The term HOSP. UNITS refers to the various units that make up a hospital. The Emergency Room Services (ERS) is the first point of contact for patients in need of urgent medical attention. Operating Room Services (ORS) provide surgical care and procedures. Critical Care Services (CCS) provide intensive care for critically ill or injured patients. Radiology and Medical Services (RMS) provide imaging and other diagnostic services. Finally, Clinical Care Units (CCUS) provide specialized care for specific conditions.