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This file provides a standardized way of associating alternate from various schemes with .

At any point in time, an alternate within a particular scheme will be associated with one and only one . A may be associated with zero or more alternate within a single scheme.

It is important to note that the and its alternate all identify precisely the same real-world object.

Note: The Identifier file is not currently used in the as use of the more flexible structure is preferred for links to alternative codes. The only known current use of this file is for internal identification of components during the content development process.

Table 12. Identifier file - Detailed Specification





Data type




identifierSchemeId (field)

SCTID (data type)


of the enumeration value from the Metadata that represents the scheme to which the value belongs. Set to a of 900000000000453004 |Identifier scheme| within the metadata .


alternateIdentifier (field)

String (data type)


String (data type) representation of the alternate in its native scheme.


effectiveTime (field)

Time (data type)


Specifies the inclusive date at which the alternate was associated with the .


active (field)

Boolean (data type)


Specifies whether the association was or from the point in time specified by the effectiveTime (field) .


moduleId (field)

SCTID (data type)


Identifies the source module that this association was created in. Set to a of 900000000000443000 |Module| within the metadata .


referencedComponentId (field)

SCTID (data type)


Uniquely identifies the with which the alternate is associated.


Only one record with the same identifierSchemeId (field) and alternateIdentifier (field) fields will be current at any point in time. The current record will be the one with the most recent effectiveTimebefore or equal to the point in time under consideration.

If the field of this record is false ('0'), then the association is at that point in time. If the field is true ('1'), then there is an identity at that point in time between the referencedComponentId (field) (a ) and the alternateIdentifier in the scheme identified by identifierSchemeId (field) .

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