Please define what the "measurement period" is in the context of the CMS-996 measure. For example:

ED Encounter with Diagnosis of STEMI

      Source: ["Encounter, Performed": "Emergency Department Visit (1010)"] EDEncounter
      With: ["Diagnosis": "STEMI"] DxSTEMI
               Such That: AND
                         Start of DxSTEMI.prevalencePeriod in EDEncounter.relevantPeriod
                         EDEncounter.relevantPeriod during "Measurement Period"

Is the measurement period the start of the ED encounter to the time of discharge? Or is it the quarter for which the qrda files are run?

Thank you.