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The representation of negation within SNOMED CT that arises from restrictions imposed by the existing description logics results logics results in the hierarchy being inverted e.g., coronary heart disease not present is NOT properly a subtype of "Heart disease not present", which is clearly incorrect. An .  An initial attempt was made to move negated content into the situation hierarchy so that the content remained available, but SNOMED SNOMED International recommends handling negation outside of SNOMED CT by the EHR vendor rather vendor rather than try and represent it incorrectly within the terminology.

concept may be stated to be possible in a clinical situation. Statements that explicitly indicate uncertainty can be considered in two possible ways: