CQL supports Choice Type, which is defined by a list of component types. In cases where result values are cast as a specific type in measure specification, such as result as Integer, result as Quantity, and result as DateTime, result values shall also be cast to their corresponding HL7 V3 data types when reporting in QRDA to ensure appropriate evaluation.

For example, the following definition specified in CMS334v4 has result cast as Integer:

Last("Assessment, Performed": "[#] Births.preterm" PretermBirth
    where PretermBirth.relevantDatetime 42 weeks or less before PCMaternal."LastTimeOfDelivery"(Encounter)
      and PretermBirth.result is not null
    sort by relevantDatetime
).result as Integer

In this case, when report Assessment Performed result in QRDA, observation/value shall be cast to the INT data type.

When report result as Quantity and as DateTime, they shall be submitted using the PQ and TS data types respectively.