Antecedent versions are older versions of SNOMED CT that are no longer maintained. They include SNOP, SNOMED, SNOMED II, SNOMED International (3.x), and SNOMED RT.
The timelines associated with earlier versions are as follows:
- 1965 SNOP
- 1974 SNOMED
- 1979 SNOMED II
- 1993 SNOMED International 3.0
- 1995 SNOMED Microglossary of Signs and Symptoms
- 1993-98 SNOMED International versions 3.1-3.5
- 2002 First release of SNOMED CT
- 2007 All versions of SNOMED acquired by IHTSDO
- 2017 All SNOMED versions except SNOMED CT have been formally deprecated by IHTSDO
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