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Defines an individual member value of a codelist including display format.

Defines an individual member value of a codelist including a display value in the child Decode element. The CodedValue must be an acceptable value of the DataType of the containing CodeList.

The CodeListItems within a single CodeList must not have duplicate CodedValues (as interpreted by the CodeList's DataType).

The Rank attribute may be used where the relative value corresponding to an enumeration cannot or should not be determined by its lexical order. For example, if you have a list of enumerated text values including "Low", "Medium", and "High" and wish to assign these relative numeric values 1, 2, and 3 respectively, you should include a Rank attribute for each CodeListItem defined. Without the applied rank attribute, the normal lexical ordering would be "High", "Low", and "Medium".

The OrderNumbers provide an ordering on the CodeListItems (within a containing CodeList) for use whenever a list of CodeList Items is presented to a user. They do not imply anything about event scheduling, time ordering, or data correctness.

The CodeListItems within a single CodeList must not have duplicate Ranks or OrderNumbers.