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Glossary ref
Migration
does not mean over-writing legacy coded data with
Glossary ref
SNOMED CT
Glossary ref
expression
. This is strongly discouraged and users are advised to ensure that data stored at the time of data entry is preserved. This is essential for two main reasons:

  • Medico-legal status of an altered clinical record may become degraded;
  • The original record may be an invaluable resource, should
    Glossary ref
    migration
    produce unexpected results.