Any set of values used in a variable in a data file, and intended to serve as a translation table or to interpret a controlled set of symbols into a natural language such as English, is considered a "code set". Such sets of value pairs (code, and interpretation of code) are installed in CEDR as Structured Documentation rather than as another data file.

a code set is any set of codes used for encoding data elements, such as tables of terms, medical concepts, medical diagnosis codes, or medical procedure codes. An example of international code set is LOINCTM (Logical Observation Identifier Names and Codes)

a collection of unambiguous rules that establishes a character set and the one-to-one relationship between each character of the set and its bit representation or numeric value