?:definition
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A coded value specifying the degree of authoritativeness or certitude of the occurrence date. EXAMPLE(S): \'date estimated\' \'date > 100 days, date is correct\' \'date < 100 days, date is correct\' OTHER NAME(S): NOTE(S): The concept of \'date unknown\' is captured by a nullFlavor of \'UNK\' on the dateRange attribute, rather than a code in this attribute. A patient might have recovered from neutrophil in the past, but isn\'t sure of the exact date and state \'I think it was in January of 2005\'. This would be recorded with an occuranceDateRange of \'January 2005\' and an uncertainOccuranceDateCode of \'estimated\'.
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