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The nature of the ambiguity will determine the steps to follow when inactivating an ambiguous concept. Follow the links below to see the steps relevant for the concept in focus.

The concept in focus may have:

Ambiguous FSN 

Ambiguous Meaning


Ambiguous concepts with a single target

A single target may be justified in the following situations:

  • If one of the meanings of the ambiguous concept is not clinically useful

  • The FSN represents a classification concept, such as ‘other’, ‘NOS’

Ambiguity between synonyms and FSN 

<Decision tree still to be created>

Ambiguity between synonyms and FSN

Misalignment between FSN and Definition 

<Decision tree still to be created>



Classification extension included in the FSN, such as OS, NOS, NEC, and other

Ambiguity arising from classification concepts

Common classification phrases

<insert a description of the common classification phrases>

OS, NOS, NEC, other



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