> For the complete documentation index, see [llms.txt](https://docs.snomed.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.snomed.org/snomed-ct-user-guides/snomed-ct-browser-guide/how-to/view-the-history-of-a-snomed-ct-concept.md). # View the history of a SNOMED CT concept | Steps | References | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------- | | In the SCT Browser *Full* perspective, press the `History` tab in the *Concept Details* panel. |

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The Concept Details panel updates to show a chronological listing (by SNOMED CT version date) of published versions of the focus concept.

Each list row shows:

Version (date in YYYY-MM-DD format).
Type of Change, showing what type of concept details were modified in that version.

| | Press a `Version` entry to switch all Concept Details to those published in that version. |

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An additional label including the version date is appended to the Concept Details panel title to maintain context whilst browsing the historical details.

Navigate around the historical details as needed using the Concept Details panel context tabs.

Changed items highlighting

When viewing the Details tab, an item that is highlighted with a blue dotted border means that item change was first published in the version being viewed.

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In the Details tab, additional metadata can be viewed for each item via the grey icon buttons to the right of the relevant item row.

Moving the cursor over the button will highlight it in blue.

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In the Details tab, when highlighted, press to see a pop-over table of information for that item, including its Effective Time (publication change date).

The Effective Time of highlighted items will match the historical version currently being viewed.

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Press at the end of the Concept Details panel title when viewing a historical version to restore the panel contents to the latest published version (the additional label will be cleared).

Changing focus also resets to latest version

Historical details will also be cleared if the Concept Details focus concept is changed.

| Provide Feedback --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.snomed.org/snomed-ct-user-guides/snomed-ct-browser-guide/how-to/view-the-history-of-a-snomed-ct-concept.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.