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In healthcare , diagnostic codes are used to group and identify diseases , disorders, symptoms , human response patterns, and medical signs , and are used to measure morbidity and mortality . As the plural with the name of this lemma indicates, there will be never one code for all purposes, but many codes for some distinct purposes each. The codes may be quite frequently revised as new knowledge is attained. DSM (see below) changes some of its coding to correspond to the codes in ICD.