The existing “count” operator in the QDM determines if the number of events meets a given threshold. In the below example, count is used to assess whether there were more than two encounters of types A-D.

COUNT > 2: 
    OR: Encounter performed: A 
    OR: Encounter performed: B 
    OR: Encounter performed: C 
    OR: Encounter performed: D 

However, in some cases the “COUNT” operator is used to determine how many of the underlying logic statements are true. In these cases, the logic must be constructed with a subset operator in each statement. This can be seen in the example below:

COUNT > 2:
    OR: FIRST: Encounter performed: A 
    OR: FIRST: Encounter performed: B 
    OR: FIRST: Encounter performed: C 
    OR: FIRST: Encounter performed: D 

This approach is not clear and the introduction of the “count true” operator helps to clarify the logic producing the following logic:

COUNT TRUE > 2: 
    OR: Encounter performed: A 
    OR: Encounter performed: B 
    OR: Encounter performed: C 
    OR: Encounter performed: D