This research study established the data elements for the health system domain in the Perioperative Nursing Data Set. A sample of AORN members were asked to confirm the clarity, necessity, measurability, and accuracy of each proposed data element. As a result of this study, the health system domain contains 114 data elements with definitions. When integrated into an electronic health record, data elements can be used to identify, compare, and evaluate the context in which patient care is delivered across settings.