SNOMED CT was a joint development between the NHS in England and the College of American Pathologists (CAP). It was formed in 1999 by the convergence of SNOMED RT and the United Kingdom's Clinical Terms Version 3 (formerly known as the Read Codes).
SNOMED itself was started in 1965 as SNOP (Systematized Nomenclature of Pathology), and later extended into other medical fields.
In 2007, the SNOMED CT intellectual property rights were transferred from the CAP to the SNOMED SDO® in the formal creation of the IHTSDO.
At the time that IHTSDO purchased the rights to SNOMED CT from the College of American Pathologists (CAP), IHTSDO also purchased rights to "antecedent intellectual property" owned by CAP, including SNOP, SNOMED, SNOMED II, SNOMED International (3.x), and SNOMED RT. Some of these old versions (or local variations or language translations which have developed over time) are still in use, particularly for histology results reporting. Many of these may no longer be officially licensed and exist only in paper format held by clinicians that are not maintained over time.
At its meeting of October 2009 the highest authority of the IHTSDO, the General Assembly made the following decisions, which should be communicated via a public announcement that:
Any current user of an antecedent version of SNOMED, who wishes for further information or help, should contact the IHTSDO. Please note that the International Release of SNOMED CT includes migration tables between antecedent versions that may be of assistance to those who are preparing to move from antecedent versions of the terminology to SNOMED CT. Furthermore, a number of additional maps are also available from country National Release Centres. Maps available internationally include a SNOMED II to SNOMED RT bridge file and a SNOMED 3.5 to SNOMED RT bridge file.
For more information please see Mapping to SNOMED CT from Legacy SNOMED versions
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