> 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-specifications/snomed-ct-release-file-specification/appendices/appendix-e-concept-enumerations/e1-concept-enumerations-for-moduleid.md). # E.1 Concept Enumerations for moduleId This concept enumeration applies to the [moduleId](/snomed-ct-specifications/snomed-ct-release-file-specification/appendices/appendix-b.-specification-reference-information/m/moduleid-field.md) field which is present in all released SNOMED CT components (RF2). The value applied to a particular component indicates the development module within which that component was created and is being maintained. Each of the values in Exhibit E.1-1 represents a SNOMED CT module. The range of permitted values is extensible by addition of branches to the hierarchy shown in modules managed by other organizations (i.e. in an extensions namespace) and to add specific module identifiers within each branch. {% hint style="danger" %} Some concepts in the moduleId hierarchy are groupers, created only for the purpose of organizing the hierarchy. These grouper concepts should not be used as a moduleId. For example, the concept [900000000000445007 |International Health Terminology Standards Development Organisation maintained module|](http://snomed.info/id/900000000000445007) must not itself be used as a moduleId. {% endhint %} **Exhibit E.1-1: Hierarchy of SNOMED CT moduleId values**

900000000000955018 |Module|
466707005 |SNOMED CT Medical Devices module|
900000000000445007 |IHTSDO maintained module|
449079008 |SNOMED CT to ICD-9CM equivalency mapping module|
449080006 |SNOMED CT to ICD-10 rule-based mapping module|
449081005 |SNOMED CT Spanish edition module|
705115006 |Technology Preview module|
715151008 |International Classification for Nursing Practice and SNOMED CT equivalency mapping

module|
715152001 |International Health Terminology Standards Development Organisation general and

family practitioner module|
715515008 |LOINC - SNOMED CT Cooperation Project module|
718291003 |International Health Terminology Standards Development Organisation dentistry

module|
722133002 |International Health Terminology Standards Development Organisation starter set

module|
733981006 |International Health Terminology Standards Development Organisation - nursing

module|
735233007 |EDQM simple map reference set module|
741814003 |SNOMED CT to UCUM simple map reference set module|
784009001 |SNOMED CT to Orphanet simple map type reference set module|
816211006 |Medical Dictionary for Regulatory Activities simple map module|
827022005 |International Patient Summary module|
900000000000012004 |SNOMED CT model component|
900000000000207008 |SNOMED CT core|

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