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The transition to SNOMED CT from legacy code systems [1 requires several changes. Many of the most important changes relate to organization and user training, which are outside the scope of this technical guide.

From the technical perspective, there are two principal migration issues.

  • Maintenance of the integrity and value of pre-existing data recorded using other coding schemes (legacy data).
  • Maintenance and development of the functionality delivered by software applications that use queries and protocols that include or refer to codes in other coding schemes (legacy queries and protocols).

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