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The design of SNOMED CT specifies that all components (concepts, descriptions and relationships) are identified using
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Prior to creating an extension, each organization will need to must obtain a unique namespace identifier from SNOMED International (see http://snomed.org/changeadd). Once the namespace identifier has been identifier is issued, SNOMED International authorizes the allocated organization to generate SCTIDs within their allocated namespace . This means that organizations can create and maintain content in their own extension.The allocated to identify extension components. Each SNOMED CT namespace identifier is 7 digits in length and is included in all SCTIDs within the extension. This ensures global uniqueness of SCTIDs across the terminology. Content in the International edition does not include a namespace identifier in the SCTID. By including this 7 digit identifier in the appropriate position within an SCTID, and maintaining locally unique item identifiers, global uniqueness of SCTIDs can be ensured.
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Note: Information about applying for a namespace identifier can be found on the SNOMED International website : at http://snomed.org/changeadd |
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The table below lists some examples of namespace identifiers and the organizations to which they are affiliated withallocated. These organizations include
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Namespace ID | OrganizationNotes | |
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1000124 | National Library of Medicine (USA) – IHTSDO MemberUS National Extension | |
1000087 | Canada Health Infoway (Canada) – IHTSDO Member In use in the English Canadian Extension | |
1000052 | National Board of Health and Welfare (Sweden) – IHTSDO Member | |
1000119 | Kaiser Permanente | SNOMED CT content extension |
1000129 | B2i International LLC |
below uses illustrates the SCTID associated with the concept
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structure of an extension SCTID using the concept
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The namespace identifier used in an extension's SCTIDs When present in an SCTID, a namespace identifier should NOT be used as a the mechanism to associate a component with a particular determine which edition or extension . This association is made with a component belongs to. Instead, the moduleId attribute and is described in the is used for this purpose. For more information, see 4.2 Modules section. |
Example
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For example, although |
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"1000087" (allocated to Canada Health Infoway) and the partition identifier "10", this concept |
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belongs to the
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in this SCTID |
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indicates that this concept was |
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originally created by Canada Health Infoway and later promoted into the International Edition. |
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For further information on content promotion, please refer to 5.7.1.3 Updating Extension. |