Code Systems
Code Systems - with the main focus on SNOMED CT at the moment, - contain all the relevant concepts that can be utilized to create Value Sets.
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Browsing
You can browse different versions of a Code System, if you click on the version tag indicated in the top-right corner of the resource's page and select an earlier version from the dropdown.
Searching
Clicking the small triangles next to the parent concepts enables users to search for concepts by expanding the tree. Besides this aforementioned manual approach, another option offers to use the filter search for lexical matches.
Most of the filters are dropdowns except for the ECL filter, which requires typing in a valid query. A content assist, which can be activated by pressing Ctrl + Space , helps users to construct ECL queries easily.
Concepts
When browsing a Code System, selecting a concept navigates users to the concept details. On the Overview tab the descriptions, properties, and metadata are revealed. Some of the content is displayed with blue color, which indicates that it is a link to another concept. Clicking on those links navigates users to the linked concept's detail page.
Concepts are read-only components and can be browsed only within a Code System.
The History tab displays the changes made to the selected concept. Each change is represented on a timeline and has an individual node. In their title, the nodes display the name of the user who did the modification and the elapsed time since the change, while the action that modified the concept can be found in the details part.
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