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Concepts can be added to an extension, either to address content gaps or to expand the scope of SNOMED CT to include concepts that are used locally. Extension concepts are distributed in a concept file, which follows the standard RF2 release file format. For more details on the principles and processes for authoring concepts in an extension, please refer to 5.4.1 2 Authoring Concepts.
Attributes
In addition to the four common attributes, extension concepts also have a definitionStatusId.
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The definitionStatusId attribute specifies whether the concept is
| Gloss |
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| t | primitive |
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| GlosTerm | primitive concept |
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or
| Gloss |
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| t | fully defined |
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| GlosTerm | Sufficiently defined concept |
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.
By default, an extension concept should be considered If defining relationships are added, which sufficiently define the concept, then the definitionStatusId should be set to | Concept |
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| ShowParts | term |
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| t | 900000000000074008 900000000000073002 |PrimativeDefined| |
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.
However, if defining relationships are added, which sufficiently define the concept, then the definitionStatusId should be set to Otherwise, the extension concept is | Concept |
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| ShowParts | term |
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| t | 900000000000073002 900000000000074008 |DefinedPrimative| |
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.
| Anchor |
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| Concept example |
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| Concept example |
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Example
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