A field in the RF2 Identifier file containing a SNOMED CT identifier which identifies the alternate code system.
Note: In practice, the identifier file is not used in the SNOMED CT International Release as the use of 5.2.3.1 Simple Map from SNOMED CT Reference Set or 5.2.3.2 Simple Map to SNOMED CT Reference Set is preferred. The only current use of this file is for internal identification during the development process.
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