Is additional information that can be associated to SNOMED CT components and reference set members.

This extra information may be of value when evaluating a particular change to a SNOMED component or aid in implementation of SNOMED CT.
Annotations are non-defining, so they do not have any impact on the classification of SNOMED CT concepts.
Annotations are not mandatory for all components or reference set members; they can be used as needed for a particular use case.

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