Null values
This Editorial Guide is used for Education Purposes Only. It is used in the Authoring Courses and Certifications. It is based on the January 2026 Editorial Guide.
Representing null values
The addition of new precoordinated content in the Clinical finding (finding) hierarchy that specifies null values, such as 'not recorded', is unacceptable. There is a use case for recording the reason that data are missing; however, this information should be recorded using a concept from the Qualifier value (qualifier value) subhierarchy rather than a Clinical finding (finding) concept.
New qualifier values of this type should be agnostic as to what data are missing but support the reason why the data are missing.
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