. . . . . . . "MSH: Persons who receive ambulatory care at an outpatient department or clinic without room and board being provided.,NCI: A patient who visits a health care facility for diagnosis or treatment without spending the night. Sometimes called a day patient.,NCI: A patient who comes to a healthcare facility for diagnosis or treatment but is not admitted for an overnight stay." . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .