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Timetable for the withdrawal of legacy SNOMED codes

In 2010 IHTSDO announced a 2009 General Assembly decision that from April 26, 2017 it would no longer license the use of SNOMED antecedent works. SNOMED antecedent works are SNOP, SNOMED, SNOMED II, SNOMED International (3.x), and SNOMED RT. It strongly urged users of these antecedent/old versions to migrate to SNOMED CT as soon as possible. The reason for phasing out support of antecedent versions is that both clinical science and the terminology itself have evolved considerably since they were first developed, so use of these older versions involves risk. IHTSDO cannot be responsible for this risk.

A limited license will be available for research purposes and to enable the interpretation of historical data captured using antecedent versions.

The biannual release of the SNOMED CT International Edition includes an antecedent SNOMED identifier reference set, which contains SNOMED, SNOMED II, and SNOMED International (3.x) concept identifiers. This reference set will be withdrawn from use according to this timeline:

  • July 2015 SNOMED CT International Edition: No change regarding antecedent SNOMED identifier reference set.
  • January 2016 SNOMED CT International Edition: The last release to include the antecedent SNOMED identifiers for new SNOMED CT content.
  • July 2016 SNOMED CT International Edition: The last release to contain the antecedent SNOMED identifier reference set.
  • January 2017 SNOMED CT International Edition: The antecedent SNOMED identifier reference set will be withdrawn and no longer be available in the release. After the antecedent SNOMED identifier reference set has been withdrawn from the International Edition, it will be made permanently available for download as a legacy IHTSDO product, here: https://mlds.ihtsdotools.org/#/viewReleases/viewRelease/5376

IHTSDO again strongly urges users of these antecedent versions to migrate to SNOMED CT as soon as possible. Information about migration to SNOMED CT is available in the Technical Implementation Guide (http://snomed.org/tig.pdf ). Files to assist in the migration from antecedent works to SNOMED CT are available to IHTSDO Members here on Collabnet.

IHTSDO Affiliate licensees may retrieve the files from here on the MLDS.

Throughout 2015 IHTSDO will remind users of antecedent versions that it will no longer license their use after 26 April, 2017.

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