The scientist that was credited for the development of a more sophisticated system for codifying medical conditions in the 1800s was William Farr.
He was a British physician that pioneered the quantitative study of morbidity and mortality by helping to establish the field of medical statistics.
He also developed a classification of causes of death, constructed the first English life table, and made contributions to epidemiology that compares mortality in specific occupations with that of the general population.
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