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Precoordinated expressions consist of a single

Gloss
SpacePreSpacetruefalse
tconcept
identifier, followed optionally by any term that is associated with that
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PreSpacefalse
tconcept
. While the use of a term is not mandated, it is often preferable to include
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tpreferred term
from an appropriate dialect within the expressions to improve the human-readability of the expression. For example:
Concept
t 73211009|Diabetes mellitus|
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As mentioned, the syntax does not require a term to be used with each concept identifier, so the following is also a valid
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PreSpacefalse
texpression
:
Concept
t 73211009|diabetes mellitus|
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