CDC National Healthcare Safety Network (NHSN) Digital Quality Measures (dQM) Content Package IG
1.0.0 - Release 1

CDC National Healthcare Safety Network (NHSN) Digital Quality Measures (dQM) Content Package IG - Downloaded Version 1.0.0 See the Directory of published versions

## Library: FHIR Helpers

Official URL: http://www.cdc.gov/nhsn/fhirportal/dqm/ig/Library/FHIRHelpers | Version: 1.0.0
Standards status: Trial-use | Maturity Level: 1 | Computable Name: FHIRHelpers

Id: | FHIRHelpers
Version: | 1.0.0
Url: | FHIRHelpers
Status: | draft
Type: | system: http://terminology.hl7.org/CodeSystem/library-type code: logic-library
Date: | 2025-09-15 11:51:36-0400
Publisher: | CDC National Healthcare Safety Network (NHSN)
Jurisdiction: | US
Content: text/cql
    /*
    @author: Bryn Rhodes
    @description: This library defines functions to convert between FHIR
     data types and CQL system-defined types, as well as functions to support
     FHIRPath implementation. For more information, see the FHIRHelpers wiki page:
     https://github.com/cqframework/clinical_quality_language/wiki/FHIRHelpers
    @allowFluent: true
    */
    library FHIRHelpers version '4.0.2'

    using FHIR version '4.0.1'

    define function ToInterval(period FHIR.Period):
        if period is null then
            null
        else
            if period."start".value is null then
                Interval(period."start".value, period."end".value]
            else
                if time from period."start".value is null and time from period."end".value is not null then
                    Interval[
                        DateTime(year from period."start".value, month from period."start".value, day from period."start".value,
                            0, 0, 0, 0, timezoneoffset from period."end".value),
                        period."end".value
                    ]
            else
                if time from period."end".value is null and time from period."start".value is not null then
                    Interval[
                        period."start".value,
                        DateTime(year from period."end".value, month from period."end".value, day from period."end".value,
                            23, 59, 59, 999, timezoneoffset from period."start".value)
                    ]
            else Interval[period."start".value, period."end".value]

    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

    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

    define function ToQuantityIgnoringComparator(quantity FHIR.Quantity):
        case
            when quantity is null then null
            when quantity.value is null then null
            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

    define function ToInterval(quantity FHIR.Quantity):
        if quantity is null then null else
            case quantity.comparator.value
                when '<' then
                    Interval[
                        null,
                        ToQuantityIgnoringComparator(quantity)
                    )
                when '<=' then
                    Interval[
                        null,
                        ToQuantityIgnoringComparator(quantity)
                    ]
                when '>=' then
                    Interval[
                        ToQuantityIgnoringComparator(quantity),
                        null
                    ]
                when '>' then
                    Interval(
                        ToQuantityIgnoringComparator(quantity),
                        null
                    ]
                else
                    Interval[ToQuantity(quantity), ToQuantity(quantity)]
            end

    define function ToRatio(ratio FHIR.Ratio):
        if ratio is null then
            null
        else
            System.Ratio { numerator: ToQuantity(ratio.numerator), denominator: ToQuantity(ratio.denominator) }

    define function ToInterval(range FHIR.Range):
        if range is null then
            null
        else
            Interval[ToQuantity(range.low), ToQuantity(range.high)]

    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
            }

    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
            }

    define function reference(reference String):
        if reference is null then
            null
        else
            Reference { reference: string { value: reference } }

    define function resolve(reference String) returns Resource: external
    define function resolve(reference Reference) returns Resource: external
    define function reference(resource Resource) returns Reference: external
    define function extension(element Element, url String) returns List<Element>: external
    define function extension(resource Resource, url String) returns List<Element>: external
    define function hasValue(element Element) returns Boolean: external
    define function getValue(element Element) returns Any: external
    define function ofType(identifier String) returns List<Any>: external
    define function is(identifier String) returns Boolean: external
    define function as(identifier String) returns Any: external
    define function elementDefinition(element Element) returns ElementDefinition: external
    define function slice(element Element, url String, name String) returns List<Element>: external
    define function checkModifiers(resource Resource) returns Resource: external
    define function checkModifiers(resource Resource, modifier String) returns Resource: external
    define function checkModifiers(element Element) returns Element: external
    define function checkModifiers(element Element, modifier String) returns Element: external
    define function conformsTo(resource Resource, structure String) returns Boolean: external
    define function memberOf(code code, valueSet String) returns Boolean: external
    define function memberOf(coding Coding, valueSet String) returns Boolean: external
    define function memberOf(concept CodeableConcept, valueSet String) returns Boolean: external
    define function subsumes(coding Coding, subsumedCoding Coding) returns Boolean: external
    define function subsumes(concept CodeableConcept, subsumedConcept CodeableConcept) returns Boolean: external
    define function subsumedBy(coding Coding, subsumingCoding Coding) returns Boolean: external
    define function subsumedBy(concept CodeableConcept, subsumingConcept CodeableConcept) returns Boolean: external
    define function htmlChecks(element Element) returns Boolean: external

    define function ToString(value AccountStatus): value.value
    define function ToString(value ActionCardinalityBehavior): value.value
    define function ToString(value ActionConditionKind): value.value
    define function ToString(value ActionGroupingBehavior): value.value
    define function ToString(value ActionParticipantType): value.value
    define function ToString(value ActionPrecheckBehavior): value.value
    define function ToString(value ActionRelationshipType): value.value
    define function ToString(value ActionRequiredBehavior): value.value
    define function ToString(value ActionSelectionBehavior): value.value
    define function ToString(value ActivityDefinitionKind): value.value
    define function ToString(value ActivityParticipantType): value.value
    define function ToString(value AddressType): value.value
    define function ToString(value AddressUse): value.value
    define function ToString(value AdministrativeGender): value.value
    define function ToString(value AdverseEventActuality): value.value
    define function ToString(value AggregationMode): value.value
    define function ToString(value AllergyIntoleranceCategory): value.value
    define function ToString(value AllergyIntoleranceCriticality): value.value
    define function ToString(value AllergyIntoleranceSeverity): value.value
    define function ToString(value AllergyIntoleranceType): value.value
    define function ToString(value AppointmentStatus): value.value
    define function ToString(value AssertionDirectionType): value.value
    define function ToString(value AssertionOperatorType): value.value
    define function ToString(value AssertionResponseTypes): value.value
    define function ToString(value AuditEventAction): value.value
    define function ToString(value AuditEventAgentNetworkType): value.value
    define function ToString(value AuditEventOutcome): value.value
    define function ToString(value BindingStrength): value.value
    define function ToString(value BiologicallyDerivedProductCategory): value.value
    define function ToString(value BiologicallyDerivedProductStatus): value.value
    define function ToString(value BiologicallyDerivedProductStorageScale): value.value
    define function ToString(value BundleType): value.value
    define function ToString(value CapabilityStatementKind): value.value
    define function ToString(value CarePlanActivityKind): value.value
    define function ToString(value CarePlanActivityStatus): value.value
    define function ToString(value CarePlanIntent): value.value
    define function ToString(value CarePlanStatus): value.value
    define function ToString(value CareTeamStatus): value.value
    define function ToString(value CatalogEntryRelationType): value.value
    define function ToString(value ChargeItemDefinitionPriceComponentType): value.value
    define function ToString(value ChargeItemStatus): value.value
    define function ToString(value ClaimResponseStatus): value.value
    define function ToString(value ClaimStatus): value.value
    define function ToString(value ClinicalImpressionStatus): value.value
    define function ToString(value CodeSearchSupport): value.value
    define function ToString(value CodeSystemContentMode): value.value
    define function ToString(value CodeSystemHierarchyMeaning): value.value
    define function ToString(value CommunicationPriority): value.value
    define function ToString(value CommunicationRequestStatus): value.value
    define function ToString(value CommunicationStatus): value.value
    define function ToString(value CompartmentCode): value.value
    define function ToString(value CompartmentType): value.value
    define function ToString(value CompositionAttestationMode): value.value
    define function ToString(value CompositionStatus): value.value
    define function ToString(value ConceptMapEquivalence): value.value
    define function ToString(value ConceptMapGroupUnmappedMode): value.value
    define function ToString(value ConditionalDeleteStatus): value.value
    define function ToString(value ConditionalReadStatus): value.value
    define function ToString(value ConsentDataMeaning): value.value
    define function ToString(value ConsentProvisionType): value.value
    define function ToString(value ConsentState): value.value
    define function ToString(value ConstraintSeverity): value.value
    define function ToString(value ContactPointSystem): value.value
    define function ToString(value ContactPointUse): value.value
    define function ToString(value ContractPublicationStatus): value.value
    define function ToString(value ContractStatus): value.value
    define function ToString(value ContributorType): value.value
    define function ToString(value CoverageStatus): value.value
    define function ToString(value CurrencyCode): value.value
    define function ToString(value DayOfWeek): value.value
    define function ToString(value DaysOfWeek): value.value
    define function ToString(value DetectedIssueSeverity): value.value
    define function ToString(value DetectedIssueStatus): value.value
    define function ToString(value DeviceMetricCalibrationState): value.value
    define function ToString(value DeviceMetricCalibrationType): value.value
    define function ToString(value DeviceMetricCategory): value.value
    define function ToString(value DeviceMetricColor): value.value
    define function ToString(value DeviceMetricOperationalStatus): value.value
    define function ToString(value DeviceNameType): value.value
    define function ToString(value DeviceRequestStatus): value.value
    define function ToString(value DeviceUseStatementStatus): value.value
    define function ToString(value DiagnosticReportStatus): value.value
    define function ToString(value DiscriminatorType): value.value
    define function ToString(value DocumentConfidentiality): value.value
    define function ToString(value DocumentMode): value.value
    define function ToString(value DocumentReferenceStatus): value.value
    define function ToString(value DocumentRelationshipType): value.value
    define function ToString(value EligibilityRequestPurpose): value.value
    define function ToString(value EligibilityRequestStatus): value.value
    define function ToString(value EligibilityResponsePurpose): value.value
    define function ToString(value EligibilityResponseStatus): value.value
    define function ToString(value EnableWhenBehavior): value.value
    define function ToString(value EncounterLocationStatus): value.value
    define function ToString(value EncounterStatus): value.value
    define function ToString(value EndpointStatus): value.value
    define function ToString(value EnrollmentRequestStatus): value.value
    define function ToString(value EnrollmentResponseStatus): value.value
    define function ToString(value EpisodeOfCareStatus): value.value
    define function ToString(value EventCapabilityMode): value.value
    define function ToString(value EventTiming): value.value
    define function ToString(value EvidenceVariableType): value.value
    define function ToString(value ExampleScenarioActorType): value.value
    define function ToString(value ExplanationOfBenefitStatus): value.value
    define function ToString(value ExposureState): value.value
    define function ToString(value ExtensionContextType): value.value
    define function ToString(value FHIRAllTypes): value.value
    define function ToString(value FHIRDefinedType): value.value
    define function ToString(value FHIRDeviceStatus): value.value
    define function ToString(value FHIRResourceType): value.value
    define function ToString(value FHIRSubstanceStatus): value.value
    define function ToString(value FHIRVersion): value.value
    define function ToString(value FamilyHistoryStatus): value.value
    define function ToString(value FilterOperator): value.value
    define function ToString(value FlagStatus): value.value
    define function ToString(value GoalLifecycleStatus): value.value
    define function ToString(value GraphCompartmentRule): value.value
    define function ToString(value GraphCompartmentUse): value.value
    define function ToString(value GroupMeasure): value.value
    define function ToString(value GroupType): value.value
    define function ToString(value GuidanceResponseStatus): value.value
    define function ToString(value GuidePageGeneration): value.value
    define function ToString(value GuideParameterCode): value.value
    define function ToString(value HTTPVerb): value.value
    define function ToString(value IdentifierUse): value.value
    define function ToString(value IdentityAssuranceLevel): value.value
    define function ToString(value ImagingStudyStatus): value.value
    define function ToString(value ImmunizationEvaluationStatus): value.value
    define function ToString(value ImmunizationStatus): value.value
    define function ToString(value InvoicePriceComponentType): value.value
    define function ToString(value InvoiceStatus): value.value
    define function ToString(value IssueSeverity): value.value
    define function ToString(value IssueType): value.value
    define function ToString(value LinkType): value.value
    define function ToString(value LinkageType): value.value
    define function ToString(value ListMode): value.value
    define function ToString(value ListStatus): value.value
    define function ToString(value LocationMode): value.value
    define function ToString(value LocationStatus): value.value
    define function ToString(value MeasureReportStatus): value.value
    define function ToString(value MeasureReportType): value.value
    define function ToString(value MediaStatus): value.value
    define function ToString(value MedicationAdministrationStatus): value.value
    define function ToString(value MedicationDispenseStatus): value.value
    define function ToString(value MedicationKnowledgeStatus): value.value
    define function ToString(value MedicationRequestIntent): value.value
    define function ToString(value MedicationRequestPriority): value.value
    define function ToString(value MedicationRequestStatus): value.value
    define function ToString(value MedicationStatementStatus): value.value
    define function ToString(value MedicationStatus): value.value
    define function ToString(value MessageSignificanceCategory): value.value
    define function ToString(value Messageheader_Response_Request): value.value
    define function ToString(value MimeType): value.value
    define function ToString(value NameUse): value.value
    define function ToString(value NamingSystemIdentifierType): value.value
    define function ToString(value NamingSystemType): value.value
    define function ToString(value NarrativeStatus): value.value
    define function ToString(value NoteType): value.value
    define function ToString(value NutritiionOrderIntent): value.value
    define function ToString(value NutritionOrderStatus): value.value
    define function ToString(value ObservationDataType): value.value
    define function ToString(value ObservationRangeCategory): value.value
    define function ToString(value ObservationStatus): value.value
    define function ToString(value OperationKind): value.value
    define function ToString(value OperationParameterUse): value.value
    define function ToString(value OrientationType): value.value
    define function ToString(value ParameterUse): value.value
    define function ToString(value ParticipantRequired): value.value
    define function ToString(value ParticipantStatus): value.value
    define function ToString(value ParticipationStatus): value.value
    define function ToString(value PaymentNoticeStatus): value.value
    define function ToString(value PaymentReconciliationStatus): value.value
    define function ToString(value ProcedureStatus): value.value
    define function ToString(value PropertyRepresentation): value.value
    define function ToString(value PropertyType): value.value
    define function ToString(value ProvenanceEntityRole): value.value
    define function ToString(value PublicationStatus): value.value
    define function ToString(value QualityType): value.value
    define function ToString(value QuantityComparator): value.value
    define function ToString(value QuestionnaireItemOperator): value.value
    define function ToString(value QuestionnaireItemType): value.value
    define function ToString(value QuestionnaireResponseStatus): value.value
    define function ToString(value ReferenceHandlingPolicy): value.value
    define function ToString(value ReferenceVersionRules): value.value
    define function ToString(value ReferredDocumentStatus): value.value
    define function ToString(value RelatedArtifactType): value.value
    define function ToString(value RemittanceOutcome): value.value
    define function ToString(value RepositoryType): value.value
    define function ToString(value RequestIntent): value.value
    define function ToString(value RequestPriority): value.value
    define function ToString(value RequestStatus): value.value
    define function ToString(value ResearchElementType): value.value
    define function ToString(value ResearchStudyStatus): value.value
    define function ToString(value ResearchSubjectStatus): value.value
    define function ToString(value ResourceType): value.value
    define function ToString(value ResourceVersionPolicy): value.value
    define function ToString(value ResponseType): value.value
    define function ToString(value RestfulCapabilityMode): value.value
    define function ToString(value RiskAssessmentStatus): value.value
    define function ToString(value SPDXLicense): value.value
    define function ToString(value SearchComparator): value.value
    define function ToString(value SearchEntryMode): value.value
    define function ToString(value SearchModifierCode): value.value
    define function ToString(value SearchParamType): value.value
    define function ToString(value SectionMode): value.value
    define function ToString(value SequenceType): value.value
    define function ToString(value ServiceRequestIntent): value.value
    define function ToString(value ServiceRequestPriority): value.value
    define function ToString(value ServiceRequestStatus): value.value
    define function ToString(value SlicingRules): value.value
    define function ToString(value SlotStatus): value.value
    define function ToString(value SortDirection): value.value
    define function ToString(value SpecimenContainedPreference): value.value
    define function ToString(value SpecimenStatus): value.value
    define function ToString(value Status): value.value
    define function ToString(value StrandType): value.value
    define function ToString(value StructureDefinitionKind): value.value
    define function ToString(value StructureMapContextType): value.value
    define function ToString(value StructureMapGroupTypeMode): value.value
    define function ToString(value StructureMapInputMode): value.value
    define function ToString(value StructureMapModelMode): value.value
    define function ToString(value StructureMapSourceListMode): value.value
    define function ToString(value StructureMapTargetListMode): value.value
    define function ToString(value StructureMapTransform): value.value
    define function ToString(value SubscriptionChannelType): value.value
    define function ToString(value SubscriptionStatus): value.value
    define function ToString(value SupplyDeliveryStatus): value.value
    define function ToString(value SupplyRequestStatus): value.value
    define function ToString(value SystemRestfulInteraction): value.value
    define function ToString(value TaskIntent): value.value
    define function ToString(value TaskPriority): value.value
    define function ToString(value TaskStatus): value.value
    define function ToString(value TestReportActionResult): value.value
    define function ToString(value TestReportParticipantType): value.value
    define function ToString(value TestReportResult): value.value
    define function ToString(value TestReportStatus): value.value
    define function ToString(value TestScriptRequestMethodCode): value.value
    define function ToString(value TriggerType): value.value
    define function ToString(value TypeDerivationRule): value.value
    define function ToString(value TypeRestfulInteraction): value.value
    define function ToString(value UDIEntryType): value.value
    define function ToString(value UnitsOfTime): value.value
    define function ToString(value Use): value.value
    define function ToString(value VariableType): value.value
    define function ToString(value VisionBase): value.value
    define function ToString(value VisionEyes): value.value
    define function ToString(value VisionStatus): value.value
    define function ToString(value XPathUsageType): value.value
    define function ToString(value base64Binary): value.value
    define function ToBoolean(value boolean): value.value
    define function ToDate(value date): value.value
    define function ToDateTime(value dateTime): value.value
    define function ToDecimal(value decimal): value.value
    define function ToDateTime(value instant): value.value
    define function ToInteger(value integer): value.value
    define function ToString(value string): value.value
    define function ToTime(value time): value.value
    define function ToString(value uri): value.value
    define function ToString(value xhtml): value.value