Patient complaint of mild chest pain since two days. Pain is also felt in left arm. Pain aggravates on climbing upstairs relieves on rest.  In this example five elements of history are there. i.e., location, duration, severity, associated sign & symptoms, modifying factors are there. Hence it is expanded history of present illness.  Note: The underlined words indicate the elements discussed in the examples.What is review of systems?The Review of Systems (ROS) is an inventory of specific body systems performed by the physician in the process of taking a history from the patient.  medical billing training india focuses on these.

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