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Prior to creating an extension, each organization must obtain a unique namespace identifier from SNOMED International (see http://snomed.org/changeadd). Once the namespace identifier is issued, SNOMED International authorizes the allocated organization to generate SCTIDs within their allocated namespace to identify extension components. Each SNOMED CT namespace identifier is 7 digits in length. 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.
Examples
The table below lists some examples of namespace identifiers and the organizations to which they are allocated. These organizations include
| Gloss |
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| PreSpace | false |
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| t | National Release Centers |
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(or NRCs), local organizations, and commercial vendors. Note that this table is an excerpt from the SNOMED CT
Namespace Registry as of October, 2017.
| Caption label |
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| CapId | examples-of-namespace-identifiers |
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| CapType | Table |
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Examples of namespace identifiers |
| Namespace ID | Organization |
|---|
| 1000124 | National Library of Medicine (USA) – IHTSDO Member |
| 1000087 | Canada Health Infoway (Canada) – IHTSDO Member |
| 1000052 | National Board of Health and Welfare (Sweden) – IHTSDO Member |
| 1000119 | Kaiser Permanente |
| 1000129 | B2i International LLC |
| Caption reference |
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| CapRefId | egextension-sctid |
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| CapRefType | Figure |
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below below illustrates the structure of an extension SCTID using the concept
| Concept |
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| t | 5281000124103 |Persistent asthma| |
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|
from the 20170301 US Edition of SNOMED CT. The structure of the SCTID has been labeled and the namespace identifier is shown in red. Note that the spaces do not form part of the SCTID and have been added to improve readability.
| Caption label |
|---|
| CapId | egextension-sctid |
|---|
| CapType | Figure |
|---|
|
The structure of an example extension SCTID |
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