The identification of the code system that defines the meaning of the symbol in the code.
Need to be unambiguous about the source of the definition of the symbol.
The URI may be an OID (urn:oid:...) or a UUID (urn:uuid:...). OIDs and UUIDs SHALL be references to the HL7 OID registry. Otherwise, the URI should come from HL7's list of FHIR defined special URIs or it should reference to some definition that establishes the system clearly and unambiguously.
Die Jahresversion des OPS Kataloges. Angegeben wird immer die vierstellige Jahreszahl (z.B. "2017")
Bie Verwendung von OPS ist die Angabe der Version zwingend erforderlich.
Hierdurch wird der Tatsache Rechnung getragen, dass jede der jährlich neu erscheinenden Fassung von OPS ein neues Codesystem darstellt.
Where the terminology does not clearly define what string should be used to identify code system versions, the recommendation is to use the date (expressed in FHIR date format) on which that version was officially published as the version date.
Indicates that this coding was chosen by a user directly - e.g. off a pick list of available items (codes or displays).
This has been identified as a clinical safety criterium - that this exact system/code pair was chosen explicitly, rather than inferred by the system based on some rules or language processing.
Amongst a set of alternatives, a directly chosen code is the most appropriate starting point for new translations. There is some ambiguity about what exactly 'directly chosen' implies, and trading partner agreement may be needed to clarify the use of this element and its consequences more completely.