define "Initial Population" : 
  "Inpatient Encounter" Encounter 
    with ["Encounter" : "Emergency Department Visit"] ED
     such that ED.status = 'finished'
       and ED.period ends 1 hour or less before start of Encounter.period

define "Inpatient Encounter" : 
  ["Encounter"] Encounter
    where LengthInDays(Encounter.period) <= 120
      and Encounter.period ends during "Measurement Period" 

define "Measure Population" : 
  "Initial Population" 

define "Measure Population Exclusion" : 
  "Inpatient Encounter" Encounter
    with ["Encounter" : "Emergency Department Visit"] ED 
      such that ED.period ends 1 hour or less before start of Encounter.period
        and ED.status = 'finished'
        and ED.hospitalization.admitSource in "Hospital Settings" 

define "Stratification 1" : 
  "Inpatient Encounter" Encounter 
    where not (PrincipalDiagnosis(Encounter).code in "Psychiatric/Mental Health Patient") 

define "Stratification 2" : 
  "Inpatient Encounter" Encounter
    where PrincipalDiagnosis(Encounter).code in "Psychiatric/Mental Health Patient" 

define "Stratification 3" : 
  "Inpatient Encounter" Encounter
    where PrincipalDiagnosis(Encounter) is null 

	Last(Split(uri, '/'))

	difference in days between start of Value and end of Value

define function "Measure Observation" (Encounter "Encounter" ) : 
  duration in minutes of "Related ED Visit"(Encounter).period

	(singleton from (Encounter.diagnosis D where D.role ~ ToConcept("Billing") and D.rank = 1)) PD
		return singleton from ([Condition: id in "GetId"(PD.condition.reference)])

define function "Related ED Visit" (Encounter "Encounter" ) : 
  Last(["Encounter" : "Emergency Department Visit"] ED 
    where ED.status = 'finished'
      and ED.period ends 1 hour or less before start of Encounter.period
    sort by start of period )