To create an expression specifically requesting information that a MedicationAdministration intentionally did not occur for a medical, patient or system reason, use the profile QICore-mednotadministered.

The following example illustrates the use of a MedicationAdministration resource:

// connectathon/fhir4/cql/EXM108_FHIR4-8.2.000.cql
define "Low Dose Unfractionated Heparin Administration":
  ["MedicationAdministration": medication in "Low Dose Unfractionated Heparin for VTE Prophylaxis"] VTEMedication
    where VTEMedication.status = 'completed'
      and VTEMedication.category ~ "Inpatient"

See the patterns page for implementation and usage patterns.