SNOMED International - Leading healthcare terminology, worldwide

Change or Add to

SNOMED CT is a growing, evolving product. Here you can learn about how you can help contribute to making it even stronger.

SNOMED CT Content Request Service (CRS)

SNOMED International coordinates requests for additions or changes to SNOMED CT through its Members' National Release Centers (NRCs). For more information about the processes in each country/territory, please access the relevant Member page from here.

Members' NRCs and other authorized users submit requests for additions or changes via the SNOMED CT Content Request Service (CRS). Requests that meet inclusion criteria for the International Release are addressed by SNOMED International staff. If a request is declined, a reason and explanation is provided to the requester, who may choose to appeal the decision to the Head of Terminology.

Please find more information about CRS here - 

Request Submisson Dates

SNOMED International is now receiving request submissions for the January 2019 SNOMED CT International Release.
Request submissions received between 6 April 2018 and 3rd October 2018 inclusive will be reviewed, however please note there are changes to the Service Level Agreement for the January 2019 release. For further details please see

An information sheet providing customer guidance for requesting changes to SNOMED CT is linked below. The document is intended to provide guidance for customers during the preparation of a request submission for the International Edition of SNOMED CT to ensure the SNOMED International authoring team has sufficient detail to deal with the request in a timely manner.

Namespace Identifiers

If you are interested in making your own content or extension you will need a Namespace Identifier so your content can be associated with you. To get a Namespace Identifier, please fill out a Namespace Identifier Application Form and email it to Please see the Information Sheets linked below to download the Namespace Allocation Policy, the Namespace Identifier Application Form, and the SNOMED CT Namespace Identifier Registry. The Namespace Registry is also available on a Google sheet.


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SNOMED International is the trading name of the International Health Terminology Standards Development Organisation a private company limited by guarantee