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A concept with a formal logic definition that is not sufficient to distinguish its meaning from other similar concepts.


  1. The meaning of SNOMED CT concept is expressed in a human-readable form by its Fully Specified Name.

  2. Each concept also has a formal logic definition represented by a set of defining relationships to other concepts. This logic definition is computer processable. A primitive concept does not have sufficient defining relationships to computably distinguish them from more general concepts(supertypes).

  3. See also sufficiently defined concept.


The concept 5596004 |atypical appendicitis (disorder)|is primitive because the following definition is not sufficient to distinguish "atypical appendicitis" from any other type of "appendicitis".

Table: Definition of 5596004|atypical appendicitis (disorder)| - (primitive)