HL7 v2+ Specification
0.0.0 - draft
HL7 v2+ Specification
0.0.0 - draft
HL7 v2+ Specification, published by HL7 International. This guide is not an authorized publication; it is the continuous build for version 0.0.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/v2ig/ and changes regularly. See the Directory of published versions
| Official URL: http://hl7.org/v2/StructureDefinition/EI | Version: 0.0.0 | |||
| Standards status: Informative | Computable Name: EI | |||
The EI is appropriate for, but not limited to, machine or software generated identifiers. The generated identifier goes in the first component. The remaining components, 2 through 4, are known as the assigning authority; they identify the machine/system responsible for generating the identifier in component 1.
The specified series, the assigning authority, is defined by components 2 through 4. The assigning authority is of the hierarchic designator (HD) data type, but it is defined as three separate components in the EI data type, rather than as a single component as would normally be the case. This is in order to maintain backward compatibility with the EI’s use as a component in several existing data fields. Otherwise, the components 2 through 4 are as defined in Section 2A.2.33, "HD - hierarchic designator". Hierarchic designators (HD) are unique across a given HL7 implementation.
Usage:
Description of Profiles, Differentials, Snapshots and how the different presentations work.
| Name | Flags | Card. | Type | Description & Constraints |
|---|---|---|---|---|
  EI |
0..* | V2ComplexDataType | entity identifier | |
  1 |
0..1 | string | Entity Identifier | |
| 2 |
0..1 | code | Namespace ID Binding: http://terminology.hl7.org/ValueSet/v2-0363 (required) | |
| 3 |
0..1 | string | Universal ID | |
 4 |
0..1 | code | Universal ID Type Binding: hl7VS-universalIdType (required) | |
| Documentation for this format | ||||
| Path | Conformance | ValueSet | URI |
| EI.2 | required | http://terminology.hl7.org/ValueSet/v2-0363http://terminology.hl7.org/ValueSet/v2-0363 | |
| EI.4 | required | Hl7VSUniversalIdTypehttp://terminology.hl7.org/ValueSet/v2-0301 |