Modifier 57 (decision for surgery) is added to an E/M code if the surgeon sees the patient and then, based upon the evaluation of the patient, decides to proceed with surgery either the same or the following day.
The US Department of Defense Dictionary of Military and Associated Terms. defines command and control as: The exercise of authority and direction by a properly designated commander over assigned and attached forces in the accomplishment of the mission.
Unity of command is a classic principle of management that is used in many hierarchical organizations, such as the military, government agencies, and corporations. Unity of command holds that an employee should only be answerable to one person.