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Medical classification, or medical coding, is the process of transforming descriptions of medical diagnoses and procedures into universal medical code numbers. The diagnoses and procedures are usually taken from a variety of sources within the health care record, such as the transcription of the physician's notes, laboratory results, radiologic results, and other sources.

Medical classification systems are used for a variety of applications in medicine, public health and medical informatics, including:

There are country specific standards and international classification systems.