> 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/c/concept/concept-enumeration.md).
# concept enumeration
A set of SNOMED CT concept identifiers used to represent values for a property of a SNOMED CT component or reference set member.
### Notes
* *Concept enumeration* serves the same purpose as more general approaches to providing enumerated lists of values (i.e. assigning a number to a value). However, the use of SNOMED CT concept identifier allows access to the human readable meaning of each enumeration using descriptions in the same way for other concepts.
* The SNOMED CT concepts used to represent *concept enumerations* are usually subtype children (or descendants) of concepts in the SNOMED CT metadata hierarchy. Each possible value is represented by a single child concept. This allows updates to the permitted values to be tracked using the component history mechanism.
### Example
* Concept enumerations for description.typeId:
[900000000000446008 |Description type (core metadata concept)|](http://snomed.info/id/900000000000446008)\
[900000000000003001 |Fully specified name (core metadata concept)|](http://snomed.info/id/900000000000003001)\
[900000000000013009 |Synonym (core metadata concept)|](http://snomed.info/id/900000000000013009)\
[900000000000550004 |Definition (core metadata concept)|](http://snomed.info/id/900000000000550004)
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-international-documents/snomed-ct-glossary/c/concept/concept-enumeration.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.