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For information on migration from SNOMED International (SNOMED 3 to 3.5) see

Glossary ref
Migration from SNOMED International
see 4.6.3 Migration from SNOMED International Version 3.

To assist in the the 

glossary-ref
Gloss
tmigration
of  of legacy data from
Glossary ref
SNOMED
II from SNOMED II (1979) and SNOP (1965), a "Bridge File" (mapping table) is available which links each legacy code to its corresponding code in the first release of of glossary-ref
Gloss
tSNOMED
CT
 (note these are same identifier identifiers as in Glossary refSNOMED those used in 
Gloss
tSNOMED RT
). The bridge file is included in the
Glossary ref
SNOMED CT International Release
distribution. The file are locating the following subdirectory:

  • SnomedCT_Release_INT_[YYYYMMDD]\RF1Release\OtherResources\BridgeFiles.

a resource file available from SNOMED Member Licensing & Distribution Service (MLDS).

The file for mapping from SNOMED 2 is in the zip archive: zres_BridgeFile_Snomed2ToSnomedRT_INT_20020131.zip

  • File name: SNO2-SRT10_Bridge.txt
    • This is a tab delimited file with column headings
  • Column 1: CODE is the SNOMED code
  • Column 4: ConceptId is the SNOMED CT Concept identifier
    • (note that the target ConceptId in SNOMED RT are the same as the identifiers in SNOMED CT)