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A coded value specifying why a disease status is missing. EXAMPLE(S): \'the sample was damaged\' is a reason code within the \'unevaluable\' classification. OTHER NAME(S): NOTE(S): The distinctions between unevaluable, missing reason and not assessed, will be made in the hierarchy of the reason codes and need not be made as distinct attributes, since they are mutually exclusive. This value should only be populated if PerformedDiagnosis.diseaseStatusCode is null.
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