Definition: The basic definition of the HD is that it identifies an (administrative or system or application or other) entity 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.
The HD is designed to be a more powerful and more general replacement for the application identifier of HL7 versions 2.1 and 2.2. It adds two additional components, the <universal ID> and the <universal ID type> to the former application ID (which is renamed more generically to be the namespace ID).
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| Comp# | FHIR | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 189 | - | - | O | HD.1 | Namespace ID | |||
| 2 | 190 | - | - | C | - | HD.2 | Universal ID | ||
| 3 | 191 | 6 | - | C | HD.3 | Universal ID Type |
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