SNOB - A SNOMED Browser
Manual
Changelog
In case you have imported multiple editions of SNOMED CT into the same database, you may choose to display the changelog of a concept in the info pane (via Options-Settings-InfoPane). The changelog can either be sorted on the date of the changes, or sorted on the identifier of the components.
The image below shows the changelog of the concept 373311009 Procedure by approach. The light green text is only shown when the option Also show when a component first appeared in Options-Settings-InfoPane is selected.
And the same, sorted on identifiers.