http://smart.who.int/immunizations/PlanDefinition/IMMZD18SSeasonalinfluenzaSeasonalInfluenza
type: PlanDefinition
node role: treeRoot
meta:
  profile:
    v: http://hl7.org/fhir/uv/cpg/StructureDefinition/cpg-recommendationdefinition
    l: cpg-recommendationdefinition
  profile:
    v: http://hl7.org/fhir/uv/crmi/StructureDefinition/crmi-shareableplandefinition
    l: crmi-shareableplandefinition
  profile:
    v: http://hl7.org/fhir/uv/crmi/StructureDefinition/crmi-publishableplandefinition
    l: crmi-publishableplandefinition
text:
  status:
    v: extensions
  div:
    v: Id: IMMZD18SSeasonalinfluenzaSeasonalInfluenza Url: IMMZ.D18.S.Seasonal influenza schedule Version: 1.0.0 Title: IMMZ.D18.S.Seasonal influenza schedule Status: draft Type: system: http://terminology.hl7.org/CodeSystem/plan-definition-type code: eca-rule Date: 2026-03-31 13:54:17+0000 Publisher: WHO Description: IMMZ.D18.S.Seasonal influenza schedule Inactivated trivalent and quadrivalent vaccines, 2-dose schedule for children aged under 9 years Knowledge Capability: computable Related Artifacts: References WHO recommendations for routine immunization - summary tables (January 2025) Libraries: IMMZD18SSeasonalinfluenzaSeasonalInfluenzaLogic Actions: Seasonal influenza dose 1: Provision of the seasonal influenza vaccine dose 1 Trigger event: Child's birth Trigger pseudo: Trigger date: "Date of birth" Create condition: Influenza vaccines are safe and effective in children from 6 months of age If: Applicability: Seasonal influenza dose 1 (Seasonal influenza dose 1) Then: Definition: IMMZ.D2.DT.CR Dynamic Values: status: ('active') payload.contentString: (Seasonal influenza dose 1 Create) category.coding: (Code { system: 'http://terminology.hl7.org/CodeSystem/communication-category', code: 'alert' }) priority: (Code { system: 'http://hl7.org/fhir/request-priority', code: 'routine' }) Seasonal influenza dose 2: Provision of the seasonal influenza vaccine dose 2 Trigger event: First seasonal influenza dose from the primary series was administered and client is less than 9 years Trigger pseudo: Count of vaccines administered (where "Vaccine type" = "Seasonal influenza vaccines" and "Type of dose" = "Primary series") = 1 AND (Today's date − "Date of birth" < 9 years) Trigger date: "Date and time of vaccination" (where "Vaccine type" = "Seasonal influenza vaccines") Create condition: Children aged 6 months to 8 years should receive 2 doses at least 4 weeks apart If: Applicability: Seasonal influenza dose 2 (Seasonal influenza dose 2) Then: Definition: IMMZ.D2.DT.CR Dynamic Va…
contained: Library
  id:
    v: effective-data-requirements
  extension:
    extension:
      url:
        v: libraryName
        l: libraryName
      value: String
        v: IMMZElements
    extension:
      url:
        v: name
        l: name
      value: String
        v: Doses Administered to Patient
    extension:
      url:
        v: statement
        l: statement
      value: String
        v: /** * @dataElement All Doses Administered to Patient */ define "Doses Administered to Patient": [Immunization] I where I.status = 'completed' and I.isSubpotent is not true
    extension:
      url:
        v: displaySequence
        l: displaySequence
      value: Integer
        v: 0
    url:
      v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
      l: cqf-logicDefinition
  extension:
    extension:
      url:
        v: libraryName
        l: libraryName
      value: String
        v: IMMZEncounterElements
    extension:
      url:
        v: name
        l: name
      value: String
        v: Doses Administered to Patient
    extension:
      url:
        v: statement
        l: statement
      value: String
        v: /** * @dataElement All Doses Administered to Patient */ define "Doses Administered to Patient": Elements."Doses Administered to Patient" I where I.occurrence.toInterval() same day or before Today
    extension:
      url:
        v: displaySequence
        l: displaySequence
      value: Integer
        v: 1
    url:
      v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
      l: cqf-logicDefinition
  extension:
    extension:
      url:
        v: libraryName
        l: libraryName
      value: String
    extension:
      url:
        v: name
        l: name
      value: String
        v: Seasonal influenza Doses Administered to Patient
    extension:
      url:
        v: statement
        l: statement
      value: String
        v: /* @internal: Seasonal influenza containing Doses Administered to Patient */ define "Seasonal influenza Doses Administered to Patient": Encounter."Doses Administered to Patient" I where I.vaccineCode in Concepts."Seasonal influenza vaccines"
    extension:
      url:
        v: displaySequence
        l: displaySequence
      value: Integer
        v: 2
    url:
      v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
      l: cqf-logicDefinition
  extension:
    extension:
      url:
        v: libraryName
        l: libraryName
      value: String
    extension:
      url:
        v: name
        l: name
      value: String
        v: Seasonal influenza Primary Series Doses Administered to Patient
    extension:
      url:
        v: statement
        l: statement
      value: String
        v: /* @internal: Seasonal influenza containing Doses Administered to Patient that are in the Primary series */ define "Seasonal influenza Primary Series Doses Administered to Patient": "Seasonal influenza Doses Administered to Patient".seriesPrimary()
    extension:
      url:
        v: displaySequence
        l: displaySequence
      value: Integer
        v: 3
    url:
      v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
      l: cqf-logicDefinition
  extension:
    extension:
      url:
        v: libraryName
        l: libraryName
      value: String
    extension:
      url:
        v: name
        l: name
      value: String
        v: Number of Seasonal influenza Primary Series Doses Administered
    extension:
      url:
        v: statement
        l: statement
      value: String
        v: /* @internal: Number of Seasonal influenza Primary Series doses */ define "Number of Seasonal influenza Primary Series Doses Administered": Count("Seasonal influenza Primary Series Doses Administered to Patient")
    extension:
      url:
        v: displaySequence
        l: displaySequence
      value: Integer
        v: 4
    url:
      v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
      l: cqf-logicDefinition
  extension:
    extension:
      url:
        v: libraryName
        l: libraryName
      value: String
    extension:
      url:
        v: name
        l: name
      value: String
        v: One seasonal influenza primary series doses were administered
    extension:
      url:
        v: statement
        l: statement
      value: String
        v: /* @input: One seasonal influenza primary series doses were administered @pseudocode: Count of vaccines administered (where "Vaccine type" = "Seasonal influenza vaccines" and "Type of dose" = "Primary series") = 1 @code: One seasonal influenza primary series doses were administered-127 @decision: IMMZ.D2.DT.Seasonal influenza: Inactivated trivalent and quadrivalent vaccines, 2-dose schedule */ define "One seasonal influenza primary series doses were administered": "Number of Seasonal influenza Primary Series Doses Administered" = 1
    extension:
      url:
        v: displaySequence
        l: displaySequence
      value: Integer
        v: 5
    url:
      v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
      l: cqf-logicDefinition
  extension:
    extension:
      url:
        v: libraryName
        l: libraryName
      value: String
    extension:
      url:
        v: name
        l: name
      value: String
        v: First seasonal influenza dose from the primary series was administered
    extension:
      url:
        v: statement
        l: statement
      value: String
        v: /* @complete: First seasonal influenza dose from the primary series was administered @pseudocode: Count of vaccines administered (where "Vaccine type" = "Seasonal influenza vaccines" and "Type of dose" = "Primary series") = 1 */ define "First seasonal influenza dose from the primary series was administered": Encounter."One seasonal influenza primary series doses were administered"

url:
  v: displaySequence
  l: displaySequence
value: Integer
  v: 6

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
    v: IMMZEncounterElements
extension:
  url:
    v: name
    l: name
  value: String
    v: Current Patient Age In Years
extension:
  url:
    v: statement
    l: statement
  value: String
    v: /** * @dataElement Patient age in years */ define "Current Patient Age In Years": AgeInYearsAt(Today)
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 7
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
extension:
  url:
    v: name
    l: name
  value: String
    v: Client's age is less than 9 years
extension:
  url:
    v: statement
    l: statement
  value: String
    v: /* @input: Client's age is less than 9 years @pseudocode: Today's date − "Date of birth" < 9 years @code: Client's age is less than 9 years-40 @decision: IMMZ.D2.DT.Seasonal influenza: Inactivated trivalent and quadrivalent vaccines, 2-dose schedule */ define "Client's age is less than 9 years": Encounter."Current Patient Age In Years" < 9
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 8
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
extension:
  url:
    v: name
    l: name
  value: String
    v: Two seasonal influenza primary series doses were administered
extension:
  url:
    v: statement
    l: statement
  value: String
    v: /* @input: Two seasonal influenza primary series doses were administered @pseudocode: Count of vaccines administered (where "Vaccine type" = "Seasonal influenza vaccines" and "Type of dose" = "Primary series") = 2 @code: Two seasonal influenza primary series doses were administered-127 @decision: IMMZ.D2.DT.Seasonal influenza: Inactivated trivalent and quadrivalent vaccines, 2-dose schedule */ define "Two seasonal influenza primary series doses were administered": "Number of Seasonal influenza Primary Series Doses Administered" = 2
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 9
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
extension:
  url:
    v: name
    l: name
  value: String
    v: Second seasonal influenza dose from the primary series was administered. The primary series has been completed
extension:
  url:
    v: statement
    l: statement
  value: String
    v: /* @complete: Second seasonal influenza dose from the primary series was administered. The primary series has been completed @pseudocode: "Completed the primary vaccination series" = TRUE (where "Vaccine type" = "Seasonal influenza vaccines") */ define "Second seasonal influenza dose from the primary series was administered. The primary series has been completed": Encounter."Two seasonal influenza primary series doses were administered"
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 10
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
extension:
  url:
    v: name
    l: name
  value: String
    v: Seasonal influenza dose 2
extension:
  url:
    v: statement
    l: statement
  value: String
    v: /* @output: Seasonal influenza dose 2 @description: Provision of the seasonal influenza vaccine dose 2 @trigger: First seasonal influenza dose from the primary series was administered and client is less than 9 years @pseudo: Count of vaccines administered (where "Vaccine type" = "Seasonal influenza vaccines" and "Type of dose" = "Primary series") = 1 AND (Today's date − "Date of birth" < 9 years) @triggerDate: "Date and time of vaccination" (where "Vaccine type" = "Seasonal influenza vaccines") */ define "Seasonal influenza dose 2": "First seasonal influenza dose from the primary series was administered" and Encounter."Client's age is less than 9 years" and not "Second seasonal influenza dose from the primary series was administered. The primary series has been completed"
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 11
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
extension:
  url:
    v: name
    l: name
  value: String
    v: Date of Latest Seasonal influenza Dose
extension:
  url:
    v: statement
    l: statement
  value: String
    v: /* @internal: Date of Latest Seasonal influenza Dose */ define "Date of Latest Seasonal influenza Dose": date from start of "Seasonal influenza Doses Administered to Patient".mostRecent().occurrence.toInterval()
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 12
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
extension:
  url:
    v: name
    l: name
  value: String
    v: Seasonal influenza dose 2 Due Date
extension:
  url:
    v: statement
    l: statement
  value: String
    v: /* @dynamicValue: Seasonal influenza dose 2 Due Date @pseudocode: "Date and time of vaccination" (where "Vaccine type" = "Seasonal influenza vaccines") + 4 weeks */ define "Seasonal influenza dose 2 Due Date": if "Seasonal influenza dose 2" then Encounter."Date of Latest Seasonal influenza Dose" + 4 weeks else null
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 13
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
extension:
  url:
    v: name
    l: name
  value: String
    v: Seasonal influenza dose 2 Expiration
extension:
  url:
    v: statement
    l: statement
  value: String
    v: /* @dynamicValue: Seasonal influenza dose 2 Expiration @pseudocode: "Date of birth" + 9 years */ define "Seasonal influenza dose 2 Expiration": if "Seasonal influenza dose 2" then Patient.birthDate + 9 years else null
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 14
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
extension:
  url:
    v: name
    l: name
  value: String
    v: Seasonal influenza dose 2 Create
extension:
  url:
    v: statement
    l: statement
  value: String
    v: /* @output: Seasonal influenza dose 2 Create @create: Children aged 6 months to 8 years should receive 2 doses at least 4 weeks apart */ define "Seasonal influenza dose 2 Create": if "Seasonal influenza dose 2" then 'Children aged 6 months to 8 years should receive 2 doses at least 4 weeks apart' + ' Due Date: ' + ToString("Seasonal influenza dose 2 Due Date") + ' Expiration: ' + ToString("Seasonal influenza dose 2 Expiration") else ''
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 15
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
extension:
  url:
    v: name
    l: name
  value: String
    v: No seasonal influenza primary series doses were administered
extension:
  url:
    v: statement
    l: statement
  value: String
    v: /* @input: No seasonal influenza primary series doses were administered @pseudocode: Count of vaccines administered (where "Vaccine type" = "Seasonal influenza vaccines" and "Type of dose" = "Primary series") = 0 @code: No seasonal influenza primary series doses were administered-127 @decision: IMMZ.D2.DT.Seasonal influenza: Inactivated trivalent and quadrivalent vaccines, 2-dose schedule */ define "No seasonal influenza primary series doses were administered": "Number of Seasonal influenza Primary Series Doses Administered" = 0
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 16
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
extension:
  url:
    v: name
    l: name
  value: String
    v: Seasonal influenza dose 1
extension:
  url:
    v: statement
    l: statement
  value: String
    v: /* @output: Seasonal influenza dose 1 @description: Provision of the seasonal influenza vaccine dose 1 @trigger: Child's birth @pseudo: @triggerDate: "Date of birth" */ define "Seasonal influenza dose 1": Encounter."No seasonal influenza primary series doses were administered" and not "First seasonal influenza dose from the primary series was administered"
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 17
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
extension:
  url:
    v: name
    l: name
  value: String
    v: Seasonal influenza dose 1 Due Date
extension:
  url:
    v: statement
    l: statement
  value: String
    v: /* @dynamicValue: Seasonal influenza dose 1 Due Date @pseudocode: "Date of birth" + 6 months */ define "Seasonal influenza dose 1 Due Date": if "Seasonal influenza dose 1" then Patient.birthDate + 6 months else null
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 18
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
extension:
  url:
    v: name
    l: name
  value: String
    v: Seasonal influenza dose 1 Create
extension:
  url:
    v: statement
    l: statement
  value: String
    v: /* @output: Seasonal influenza dose 1 Create @create: Influenza vaccines are safe and effective in children from 6 months of age */ define "Seasonal influenza dose 1 Create": if "Seasonal influenza dose 1" then 'Influenza vaccines are safe and effective in children from 6 months of age' + ' Due Date: ' + ToString("Seasonal influenza dose 1 Due Date") else ''
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 19
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
extension:
  url:
    v: name
    l: name
  value: String
    v: Client's age is more than or equal to 9 years
extension:
  url:
    v: statement
    l: statement
  value: String
    v: /* @input: Client's age is more than or equal to 9 years @pseudocode: Today's date − "Date of birth" ≥ 9 years @code: Client's age is more than or equal to 9 years-40 @decision: IMMZ.D2.DT.Seasonal influenza: Inactivated trivalent and quadrivalent vaccines, 2-dose schedule */ define "Client's age is more than or equal to 9 years": Encounter."Current Patient Age In Years" >= 9
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 20
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
extension:
  url:
    v: name
    l: name
  value: String
    v: Seasonal influenza annual dose
extension:
  url:
    v: statement
    l: statement
  value: String
    v: /* @output: Seasonal influenza annual dose @description: Provision of the seasonal influenza vaccine annual dose @trigger: The primary series has been completed @pseudo: "Completed the primary vaccination series" = TRUE (where "Vaccine type" = "Seasonal influenza vaccines") @triggerDate: Latest "Date and time of vaccination" (where "Vaccine type" = "Seasonal influenza vaccines") */ define "Seasonal influenza annual dose": ( "Second seasonal influenza dose from the primary series was administered. The primary series has been completed" or ( "First seasonal influenza dose from the primary series was administered" and Encounter."Client's age is more than or equal to 9 years" ) )
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 21
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
extension:
  url:
    v: name
    l: name
  value: String
    v: Seasonal influenza annual dose Due Date
extension:
  url:
    v: statement
    l: statement
  value: String
    v: /* @dynamicValue: Seasonal influenza annual dose Due Date @pseudocode: Latest "Date and time of vaccination" (where "Vaccine type" = "Seasonal influenza vaccines") + 1 year */ define "Seasonal influenza annual dose Due Date": if "Seasonal influenza annual dose" then Encounter."Date of Latest Seasonal influenza Dose" + 1 year else null
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 22
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
extension:
  url:
    v: name
    l: name
  value: String
    v: Seasonal influenza annual dose Create
extension:
  url:
    v: statement
    l: statement
  value: String
    v: /* @output: Seasonal influenza annual dose Create @create: Seasonal influenza vaccine annual dose should be provided 1 year after the previous dose */ define "Seasonal influenza annual dose Create": if "Seasonal influenza annual dose" then 'Seasonal influenza vaccine annual dose should be provided 1 year after the previous dose' + ' Due Date: ' + ToString("Seasonal influenza annual dose Due Date") else ''
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 23
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
    v: IMMZCommon
extension:
  url:
    v: name
    l: name
  value: String
    v: seriesPrimary
extension:
  url:
    v: statement
    l: statement
  value: String
    v: /** * @description: Gets the doses from the primary series */ define fluent function seriesPrimary(immunizations List<Immunization>): immunizations I where exists( I.protocolApplied pa where pa.series = 'Primary series' )
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 24
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
    v: FHIRHelpers
extension:
  url:
    v: name
    l: name
  value: String
    v: ToString
extension:
  url:
    v: statement
    l: statement
  value: String
    v: define function ToString(value string): value.value
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 25
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
    v: FHIRHelpers
extension:
  url:
    v: name
    l: name
  value: String
    v: ToString
extension:
  url:
    v: statement
    l: statement
  value: String
    v: define function ToString(value ImmunizationStatus): value.value
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 26
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
    v: FHIRHelpers
extension:
  url:
    v: name
    l: name
  value: String
    v: ToBoolean
extension:
  url:
    v: statement
    l: statement
  value: String
    v: define function ToBoolean(value boolean): value.value
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 27
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
    v: WHOCommon
extension:
  url:
    v: name
    l: name
  value: String
    v: toInterval
extension:
  url:
    v: statement
    l: statement
  value: String
    v: /* From FHIRCommon 4.1.0: */ /* @description: Normalizes a value that is a choice of timing-valued types to an equivalent interval @comment: Normalizes a choice type of FHIR.dateTime, FHIR.Period, FHIR.Timing, FHIR.instance, FHIR.string, FHIR.Age, or FHIR.Range types to an equivalent interval. This selection of choice types is a superset of the majority of choice types that are used as possible representations for timing-valued elements in FHIR, allowing this function to be used across any resource. The input can be provided as a dateTime, Period, Timing, instant, string, Age, or Range. The intent of this function is to provide a clear and concise mechanism to treat single elements that have multiple possible representations as intervals so that logic doesn't have to account for the variability. More complex calculations (such as medication request period or dispense period calculation) need specific guidance and consideration. That guidance may make use of this function, but the focus of this function is on single element calculations where the semantics are unambiguous. If the input is a dateTime, the result a DateTime Interval beginning and ending on that dateTime. If the input is a Period, the result is a DateTime Interval. If the input is a Timing, an error is raised indicating a single interval cannot be computed from a Timing. If the input is an instant, the result is a DateTime Interval beginning and ending on that instant. If the input is a string, an error is raised indicating a single interval cannot be computed from a string. If the input is an Age, the result is a DateTime Interval beginning when the patient was the given Age, and ending immediately prior to when the patient was the given Age plus one year. If the input is a Range, the result is a DateTime Interval beginning when the patient was the Age given by the low end of the Range, and ending immediately prior to when the patient was the Age given by the high end of the Range plus one year. NOTE: …
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 28
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
    v: FHIRHelpers
extension:
  url:
    v: name
    l: name
  value: String
    v: ToDateTime
extension:
  url:
    v: statement
    l: statement
  value: String
    v: define function ToDateTime(value dateTime): value.value
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 29
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
    v: FHIRHelpers
extension:
  url:
    v: name
    l: name
  value: String
    v: ToInterval
extension:
  url:
    v: statement
    l: statement
  value: String
    v: define function ToInterval(period FHIR.Period): if period is null then null else if period."start" is null then Interval(period."start".value, period."end".value] else Interval[period."start".value, period."end".value]
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 30
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
    v: FHIRHelpers
extension:
  url:
    v: name
    l: name
  value: String
    v: ToDateTime
extension:
  url:
    v: statement
    l: statement
  value: String
    v: define function ToDateTime(value instant): value.value
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 31
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
    v: FHIRHelpers
extension:
  url:
    v: name
    l: name
  value: String
    v: ToDate
extension:
  url:
    v: statement
    l: statement
  value: String
    v: define function ToDate(value date): value.value
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 32
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
    v: FHIRHelpers
extension:
  url:
    v: name
    l: name
  value: String
    v: ToQuantity
extension:
  url:
    v: statement
    l: statement
  value: String
    v: define function ToQuantity(quantity FHIR.Quantity): case when quantity is null then null when quantity.value is null then null when quantity.comparator is not null then Message(null, true, 'FHIRHelpers.ToQuantity.ComparatorQuantityNotSupported', 'Error', 'FHIR Quantity value has a comparator and cannot be converted to a System.Quantity value.') when quantity.system is null or quantity.system.value = 'http://unitsofmeasure.org' or quantity.system.value = 'http://hl7.org/fhirpath/CodeSystem/calendar-units' then System.Quantity { value: quantity.value.value, unit: ToCalendarUnit(Coalesce(quantity.code.value, quantity.unit.value, '1')) } else Message(null, true, 'FHIRHelpers.ToQuantity.InvalidFHIRQuantity', 'Error', 'Invalid FHIR Quantity code: ' & quantity.unit.value & ' (' & quantity.system.value & '|' & quantity.code.value & ')') end
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 33
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
    v: FHIRHelpers
extension:
  url:
    v: name
    l: name
  value: String
    v: ToCalendarUnit
extension:
  url:
    v: statement
    l: statement
  value: String
    v: define function ToCalendarUnit(unit System.String): case unit when 'ms' then 'millisecond' when 's' then 'second' when 'min' then 'minute' when 'h' then 'hour' when 'd' then 'day' when 'wk' then 'week' when 'mo' then 'month' when 'a' then 'year' else unit end
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 34
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
    v: FHIRHelpers
extension:
  url:
    v: name
    l: name
  value: String
    v: ToConcept
extension:
  url:
    v: statement
    l: statement
  value: String
    v: define function ToConcept(concept FHIR.CodeableConcept): if concept is null then null else System.Concept { codes: concept.coding C return ToCode(C), display: concept.text.value }
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 35
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
    v: FHIRHelpers
extension:
  url:
    v: name
    l: name
  value: String
    v: ToCode
extension:
  url:
    v: statement
    l: statement
  value: String
    v: define function ToCode(coding FHIR.Coding): if coding is null then null else System.Code { code: coding.code.value, system: coding.system.value, version: coding.version.value, display: coding.display.value }
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 36
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

extension:
  url:
    v: libraryName
    l: libraryName
  value: String
    v: WHOCommon
extension:
  url:
    v: name
    l: name
  value: String
    v: mostRecent
extension:
  url:
    v: statement
    l: statement
  value: String
    v: define fluent function mostRecent(immunizations List<Immunization>): Last( immunizations I sort by start of occurrence.toInterval() )
extension:
  url:
    v: displaySequence
    l: displaySequence
  value: Integer
    v: 37
url:
  v: http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition
  l: cqf-logicDefinition

v: EffectiveDataRequirements

v: active

coding:
  system:
    v: http://terminology.hl7.org/CodeSystem/library-type
    l: library-type
  code:
    v: module-definition

type:
  v: depends-on
display:
  v: FHIR model information
resource:
  v: http://fhir.org/guides/cqf/common/Library/FHIR-ModelInfo|4.0.1
  l: http://fhir.org/guides/cqf/common/Library/FHIR-ModelInfo

type:
  v: depends-on
display:
  v: Library Encounter
resource:
  v: http://smart.who.int/immunizations/Library/IMMZD2DTSeasonalinfluenzaEncounterElements

type:
  v: depends-on
display:
  v: Library Common
resource:
  v: http://smart.who.int/immunizations/Library/IMMZCommon
  l: IMMZCommon

type:
  v: depends-on
display:
  v: Library FHIRHelpers
resource:
  v: http://fhir.org/guides/cqf/common/Library/FHIRHelpers|4.0.1
  l: http://fhir.org/guides/cqf/common/Library/FHIRHelpers

type:
  v: depends-on
display:
  v: Library Encounter
resource:
  v: http://smart.who.int/immunizations/Library/IMMZEncounterElements
  l: IMMZEncounterElements

type:
  v: depends-on
display:
  v: Library Elements
resource:
  v: http://smart.who.int/immunizations/Library/IMMZElements
  l: IMMZElements

type:
  v: depends-on
display:
  v: Library WC
resource:
  v: http://smart.who.int/immunizations/Library/WHOCommon
  l: WHOCommon

type:
  v: depends-on
display:
  v: Library Concepts
resource:
  v: http://smart.who.int/immunizations/Library/IMMZConcepts
  l: IMMZConcepts

type:
  v: depends-on
display:
  v: Value set Seasonal influenza vaccines
resource:
  v: http://smart.who.int/immunizations/ValueSet/IMMZ.Z.DE18
  l: IMMZ.Z.DE18

name:
  v: Today
use:
  v: in
min:
  v: 0
max:
  v: 1
type:
  v: date

name:
  v: Seasonal influenza dose 2 Create
use:
  v: out
min:
  v: 0
max:
  v: 1
type:
  v: string

name:
  v: Seasonal influenza dose 1 Create
use:
  v: out
min:
  v: 0
max:
  v: 1
type:
  v: string

name:
  v: Seasonal influenza dose 1
use:
  v: out
min:
  v: 0
max:
  v: 1
type:
  v: boolean

name:
  v: Seasonal influenza dose 2
use:
  v: out
min:
  v: 0
max:
  v: 1
type:
  v: boolean

name:
  v: Seasonal influenza annual dose
use:
  v: out
min:
  v: 0
max:
  v: 1
type:
  v: boolean

name:
  v: Seasonal influenza annual dose Create
use:
  v: out
min:
  v: 0
max:
  v: 1
type:
  v: string

type:
  v: Immunization
profile:
  v: http://hl7.org/fhir/StructureDefinition/Immunization
  l: Immunization
must support:
  v: status
must support:
  v: isSubpotent
must support:
  v: protocolApplied
must support:
  v: occurrence
code filter:
  path:
    v: status
  code:
    code:
      v: completed

type:
  v: Immunization
profile:
  v: http://hl7.org/fhir/StructureDefinition/Immunization
  l: Immunization
must support:
  v: occurrence
must support:
  v: protocolApplied

type:
  v: Immunization
profile:
  v: http://hl7.org/fhir/StructureDefinition/Immunization
  l: Immunization
must support:
  v: status
must support:
  v: isSubpotent
must support:
  v: occurrence
must support:
  v: vaccineCode
must support:
  v: protocolApplied
code filter:
  path:
    v: status
  code:
    code:
      v: completed
code filter:
  path:
    v: vaccineCode
  value set:
    v: http://smart.who.int/immunizations/ValueSet/IMMZ.Z.DE18
    l: IMMZ.Z.DE18

type:
  v: Patient
profile:
  v: http://hl7.org/fhir/StructureDefinition/Patient
  l: Patient
must support:
  v: birthDate

url:
  v: http://hl7.org/fhir/uv/cpg/StructureDefinition/cpg-knowledgeCapability
  l: cpg-knowledgeCapability
value: Code
  v: computable

url:
  v: http://hl7.org/fhir/uv/crmi/StructureDefinition/crmi-effectiveDataRequirements
  l: crmi-effectiveDataRequirements
value: Canonical
  v: #effective-data-requirements
  l: effective-data-requirements

v: 1.0.0

v: IMMZ.D18.S.Seasonal influenza schedule

coding:
  system:
    v: http://terminology.hl7.org/CodeSystem/plan-definition-type
    l: plan-definition-type
  code:
    v: eca-rule

v: draft

v: false

v: 2026-03-31T13:54:17+00:00

v: WHO

name:
  v: WHO
telecom:
  system:
    v: url
  value:
    v: http://who.int

v: IMMZ.D18.S.Seasonal influenza schedule Inactivated trivalent and quadrivalent vaccines, 2-dose schedule for children aged under 9 years

type:
  v: citation
citation:
  v: WHO recommendations for routine immunization - summary tables (January 2025)

title:
  v: Seasonal influenza dose 1
description:
  v: Provision of the seasonal influenza vaccine dose 1 Trigger event: Child's birth Trigger pseudo: Trigger date: "Date of birth" Create condition: Influenza vaccines are safe and effective in children from 6 months of age
condition:
  kind:
    v: applicability
  expression:
    description:
      v: Seasonal influenza dose 1
    language:
      v: text/cql-identifier
    expression:
      v: Seasonal influenza dose 1
definition: Canonical
  v: http://smart.who.int/immunizations/ActivityDefinition/IMMZD2DTCR
  l: IMMZD2DTCR
dynamic value:
  path:
    v: status
  expression:
    language:
      v: text/cql-expression
    expression:
      v: 'active'
dynamic value:
  path:
    v: payload.contentString
  expression:
    language:
      v: text/cql-identifier
    expression:
      v: Seasonal influenza dose 1 Create
dynamic value:
  path:
    v: category.coding
  expression:
    description:
      v: Category of communication
    language:
      v: text/cql-expression
    expression:
      v: Code { system: 'http://terminology.hl7.org/CodeSystem/communication-category', code: 'alert' }
dynamic value:
  path:
    v: priority
  expression:
    description:
      v: Alert priority
    language:
      v: text/cql-expression
    expression:
      v: Code { system: 'http://hl7.org/fhir/request-priority', code: 'routine' }

title:
  v: Seasonal influenza dose 2
description:
  v: Provision of the seasonal influenza vaccine dose 2 Trigger event: First seasonal influenza dose from the primary series was administered and client is less than 9 years Trigger pseudo: Count of vaccines administered (where "Vaccine type" = "Seasonal influenza vaccines" and "Type of dose" = "Primary series") = 1 AND (Today's date − "Date of birth" < 9 years) Trigger date: "Date and time of vaccination" (where "Vaccine type" = "Seasonal influenza vaccines") Create condition: Children aged 6 months to 8 years should receive 2 doses at least 4 weeks apart
condition:
  kind:
    v: applicability
  expression:
    description:
      v: Seasonal influenza dose 2
    language:
      v: text/cql-identifier
    expression:
      v: Seasonal influenza dose 2
definition: Canonical
  v: http://smart.who.int/immunizations/ActivityDefinition/IMMZD2DTCR
  l: IMMZD2DTCR
dynamic value:
  path:
    v: status
  expression:
    language:
      v: text/cql-expression
    expression:
      v: 'active'
dynamic value:
  path:
    v: payload.contentString
  expression:
    language:
      v: text/cql-identifier
    expression:
      v: Seasonal influenza dose 2 Create
dynamic value:
  path:
    v: category.coding
  expression:
    description:
      v: Category of communication
    language:
      v: text/cql-expression
    expression:
      v: Code { system: 'http://terminology.hl7.org/CodeSystem/communication-category', code: 'alert' }
dynamic value:
  path:
    v: priority
  expression:
    description:
      v: Alert priority
    language:
      v: text/cql-expression
    expression:
      v: Code { system: 'http://hl7.org/fhir/request-priority', code: 'routine' }

title:
  v: Seasonal influenza annual dose
description:
  v: Provision of the seasonal influenza vaccine annual dose Trigger event: The primary series has been completed Trigger pseudo: "Completed the primary vaccination series" = TRUE (where "Vaccine type" = "Seasonal influenza vaccines") Trigger date: Latest "Date and time of vaccination" (where "Vaccine type" = "Seasonal influenza vaccines") Create condition: Seasonal influenza vaccine annual dose should be provided 1 year after the previous dose
condition:
  kind:
    v: applicability
  expression:
    description:
      v: Seasonal influenza annual dose
    language:
      v: text/cql-identifier
    expression:
      v: Seasonal influenza annual dose
definition: Canonical
  v: http://smart.who.int/immunizations/ActivityDefinition/IMMZD2DTCR
  l: IMMZD2DTCR
dynamic value:
  path:
    v: status
  expression:
    language:
      v: text/cql-expression
    expression:
      v: 'active'
dynamic value:
  path:
    v: payload.contentString
  expression:
    language:
      v: text/cql-identifier
    expression:
      v: Seasonal influenza annual dose Create
dynamic value:
  path:
    v: category.coding
  expression:
    description:
      v: Category of communication
    language:
      v: text/cql-expression
    expression:
      v: Code { system: 'http://terminology.hl7.org/CodeSystem/communication-category', code: 'alert' }
dynamic value:
  path:
    v: priority
  expression:
    description:
      v: Alert priority
    language:
      v: text/cql-expression
    expression:
      v: Code { system: 'http://hl7.org/fhir/request-priority', code: 'routine' }