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Description:
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Health Level 7 (HL7), Inc., an ANSI-accredited standards developing organization operating in the healthcare arena
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Information:
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HL7 Version 3 artefacts use OIDs to identify coding schemes and identifier namespaces.
The HL7 OID registry is structured as follows:
1 : HL7 registered internal objects (other than published documents and organizational bodies);
2 : HL7 organizational bodies and groups;
3 : External groups that have been issued an HL7 OID root for their own use;
4 : Registered externally maintained identifier systems and namespaces;
5 : HL7 Internal Code Systems;
6 : Registered external coding systems (with an HL7 issued OID);
7 : HL7 published documents (standards, tutorial slides, implementation guides, databases, published Reference Information Model (RIM) graphic billboards, etc);
8 : HL7 OID registered documentation products and artifacts;
9 : HL7 Registered conformance profiles;
10 : HL7 Registered Templates;
11 : HL7 defined and registered Value Sets;
12 : HL7 Version 2.x tables as code systems;
13 : Externally authored and curated Value Sets, HL7 registered;
14 : Internal use;
15 : Small code sets externally defined (similar to v2.x tables);
19 : HL7 Examples Root used for published examples; meaningless identifier, not to be used for any actual entities.
See also the not-authoritative overview of OIDs used in European HL7 artefacts maintained by Rene Spronk.
The process of registering an OID with HL7 is the addition to a central registry of an OID and its descriptive data. The OID doesn't have to be within the HL7 root OID or any specific other root or branch OID. Once a scheme has been registered, no other OIDs that identify the same scheme can be registered.
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