See the patterns page for implementation and usage patterns.

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

define "Antithrombotic Therapy at Discharge":
  ["MedicationRequest": medication in "Antithrombotic Therapy"] Antithrombotic
    where exists (Antithrombotic.category C where FHIRHelpers.ToConcept(C) in { Global."Community", Global."Discharge" })
      and Antithrombotic.status in { 'active', 'completed' }
      and Antithrombotic.intent.value = 'order'