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There are three categories of data that cannot be coded in NCI Thesaurus (NCIt): 1- invalid data, 2-unconfirmable data, 3-incompatible data.

NEW CONCEPTS

1. Concepts that are ambiguous or unclear will not be accepted as part of the NCIt. NCIt aims for clarity and precision.
2. NCIt will not create a new concept for which there is an existing semantically equivalent concept.
3. Terms for concepts will follow U.S.-style English spelling rules and will not include non-conventional and/or excessive punctuation c
4. Terms that are excessively complex (e.g., containing conjunctions or disjunctions, such as "and," "or," or "and/or") generally will not be included as conceptual entities. This includes exclusion due to extensive pre-coordination of the term.
5. Terms accepted should be widely used in the relevant domain, as evidenced by related authoritative references, except in the cases where the concept is a newly recognized or an emerging entity. NCIt will not add concepts where requested terms are without widely accepted usage and meaning. Exceptions to this rule include new or emerging concepts for which there is only study documentation, manufacturer publication, emerging research, etc.
6. NCIt Preferred Terms will generally not contain syntactic variation or unusual punctuation, and they will not follow foreign spelling rules (i.e. British, French, etc.) or contain special characters.

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