10.14 HL7v2 Hierarchic Designator Macro

Table 10-17 describes the attributes for identifying an entity (system, organization, agency, or department) that has responsibility for managing or assigning a defined set of instance identifiers (such as placer or filler number, patient identifiers, provider identifiers, etc.). This entity could be a particular health care application such as a registration system that assigns patient identifiers, a governmental entity such as a licensing authority that assigns professional identifiers or drivers’ license numbers, or a facility where such identifiers are assigned.

Note: This definition is identical to HL7 v2.5, Section 2.A.33, with only minor changes for editorial style.

These attributes are equivalent to the components of the HL7 v2 Hierarchic Designator (HD) and Entity Identifier (EI) data types (see HL7 v2 Chapter 2.A).

If both Local Namespace Entity ID (0040,0031) and Universal Entity ID (0040,0032) are present, they shall refer to the same entity.


Attribute Name Tag Type Attribute Description
Local Namespace Entity ID (0040,0031) 1C Identifies an entity within the local namespace or domain. Required if Universal Entity ID (0040,0032) is not present; may be present otherwise.
Universal Entity ID (0040,0032) 1C Universal or unique identifier for an entity. Required if Local Namespace Entity ID (0040,0031) is not present; may be present otherwise.
Universal Entity ID Type (0040,0033) 1C Standard defining the format of the Universal Entity ID. Required if Universal Entity ID (0040,0032) is present. Defined Terms: DNS An Internet dotted name. Either in ASCII or as integers EUI64 An IEEE Extended Unique Identifier ISO An International Standards Organization Object Identifier URI Uniform Resource Identifier UUID The DCE Universal Unique Identifier X400 An X.400 MHS identifier X500 An X.500 directory name