DICOM PS3.3 2021e - Information Object Definitions
C.17.3.2.2 Concept Name Code Sequence

Concept Name Code Sequence (0040,A043) conveys the name of the concept whose value is expressed by the value Attribute or set of Attributes. Depending on the Value Type (0040,A040), the meaning of the Concept Name Code Sequence may reflect specifics of the use of the particular data type (see Table C.17.3-7).

DICOM PS3.3 2021e - Information Object Definitions