History of the present illness

Following the chief complaint in medical history taking, a history of the present illness (abbreviated HPI) (termed history of presenting complaint (HPC) in the UK) refers to a detailed interview prompted by the chief complaint or presenting symptom (for example, pain).
Questions to include.
Different sources include different questions to be asked while conducting an HPI.
Several acronyms have been developed to categorize the appropriate questions to include.
The Centers for Medicare and Medicaid Services has published criteria for what constitutes a reimbursable HPI. A "brief HPI" constitutes one to three of these elements. An "extended HPI" includes four or more of these elements.
Also usable is SOCRATES. For chronic pain, the Stanford Five may be assessed to understand the pain experience from the patient's primary belief system.