> 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-international-documents/snomed-ct-glossary/t/top-level-concept.md).

# top level concept

## top level concept

A concept that is directly related to the root concept by a subtype relationship.

#### Notes

* All other concepts are subtype descendants of at least one *top level concept*.

#### Examples

* The list below shows the top level concept in the 2019-01-31 SNOMED CT International Release.

[138875005 |SNOMED CT Concept|](http://snomed.info/id/138875005) ⬅︎ The root concept\
[123037004 |Body structure|](http://snomed.info/id/123037004)\
[404684003 |Clinical finding|](http://snomed.info/id/404684003)\
[308916002 |Environment or geographical location|](http://snomed.info/id/308916002)\
[272379006 |Event|](http://snomed.info/id/272379006)\
[363787002 |Observable entity|](http://snomed.info/id/363787002)\
[410607006 |Organism|](http://snomed.info/id/410607006)\
[373873005 |Pharmaceutical / biologic product|](http://snomed.info/id/373873005)\
[78621006 |Physical force|](http://snomed.info/id/78621006)\
[260787004 |Physical object|](http://snomed.info/id/260787004)\
[71388002 |Procedure|](http://snomed.info/id/71388002)\
[362981000 |Qualifier value|](http://snomed.info/id/362981000)\
[419891008 |Record artifact|](http://snomed.info/id/419891008)\
[243796009 |Situation with explicit context|](http://snomed.info/id/243796009)\
[48176007 |Social context|](http://snomed.info/id/48176007)\
[370115009 |Special concept|](http://snomed.info/id/370115009)\
[123038009 |Specimen|](http://snomed.info/id/123038009)\
[254291000 |Staging and scales|](http://snomed.info/id/254291000)\
[105590001 |Substance|](http://snomed.info/id/105590001)\
[900000000000441003 |SNOMED CT Model Component|](http://snomed.info/id/900000000000441003)

##

<a href="https://docs.google.com/forms/d/e/1FAIpQLScTmbZIf0UEQwYDkY27EEWBkaiYkHSbR0_9DmFrMLXoQLyL7Q/viewform?usp=pp_url&#x26;entry.1767247133=SNOMED+Glossary&#x26;entry.670899847=top%20level%20concept" class="button primary">Provide Feedback</a>


---

# 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-international-documents/snomed-ct-glossary/t/top-level-concept.md?ask=<question>&goal=<endgoal>
```

`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.