# 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)

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