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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| SNOMED CT | 3/6 | https://en.wikipedia.org/wiki/SNOMED_CT | reference | science, encyclopedia | 2026-05-05T07:13:59.990399+00:00 | kb-cron |
Such expressions are said to have been 'postcoordinated'. Post-coordination avoids the need to create large numbers of defined Concepts within SNOMED CT. However, many systems only allow for precoordinated representations. Reliable analysis and comparison of post-coordinated expressions is possible using appropriate algorithms machinery to efficiently process the expression taking account of the underlying description logic. Major Electronic Health Record Systems (EHRS) have repeatedly complained to IHTSDO and other standards organizations about the "complexity" of post-coordinated expressions. For example, the postcoordinated expression above can be transformed using a set of standard rules to the following "normal form expression" which enables comparison with similar concepts.
64572001 | disease | : 246075003 | causative agent | = 47448006 | hot water | , 363698007 | finding site | = ( 83738005 | index finger structure | : 272741003 | laterality | = 7771000 | left | ) , { 116676008 | associated morphology | = 80247002 | third degree burn injury | , 363698007 | finding site | = 39937001 | skin structure | }
Postcoordination is an important desirable feature of a terminology. Prior 2020, International Classification of Diseases (ICD) did not allow post-coordination and SNOMED CT was the only terminology that supported postcoordination. Since 2020, a new version of ICD-11 now also supports postcoordination.
=== Veterinary content === The International Edition of SNOMED CT only includes human terms. In 2014, clearly veterinary concepts were moved into a SNOMED CT veterinary extension. This extension is managed by the Veterinary Terminology Services Lab at the Va-Md College of Veterinary Medicine at Virginia Tech.