If a value is an exceptional value (NULL-value), this specifies in what way and why proper information is missing.

The plain code symbol defined by the code system. For example, "784.0" is the code symbol of the ICD-9 code "784.0" for headache.

Specifies the code system that defines the code.

The common name of the coding system.

If applicable, a version descriptor defined specifically for the given code system.

A name or title for the code, under which the sending system shows the code value to its users.

The text or phrase used as the basis for the coding.

A set of other concept descriptors that translate this concept descriptor into other code systems.

Specifies additional codes that increase the specificity of the the primary code.

The valueSetVersion extension adds an attribute for elements with a CD dataType which indicates the version of the particular value set constraining the coded concept.

The valueSetVersion extension adds an attribute for elements with a CD dataType which indicates the version of the particular value set constraining the coded concept.