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In page Chief complaint:

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The chief complaint, formally known as CC in the medical field, or termed presenting complaint (PC) in Europe and Canada, forms the second step of medical history taking. It is sometimes also referred to as reason for encounter (RFE), presenting problem, problem on admission or reason for presenting.[citation needed][1] The chief complaint is a concise statement describing the symptom, problem, condition, diagnosis, physician-recommended return, or other reason for a medical encounter.[2] In some instances, the nature of a patient's chief complaint may determine if services are covered by health insurance.[3]