Table 1 Years of release of major versions of SNOP and SNOMED (Source: http://www.snomed.org/).
| 1965 | SNOP |
| 1974 | SNOMED |
| 1979 | SNOMED II |
| 1993 | SNOMED Version 3.0 |
| 1997 | LOINC codes integrated into SNOMED |
| 1998 | SNOMED Version 3.5 |
| 2000 | SNOMED RT |
| 2002 | SNOMED CT |