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: NHSN Helpers

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

Id: | NHSNHelpers
Version: | 1.0.0
Url: | NHSNHelpers
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
Related Artifacts: | Dependencies http://fhir.org/guides/cqf/common/Library/FHIR-ModelInfo|4.0.1 `http://www.cdc.gov/nhsn/fhirportal/dqm/ig/Library/FHIRHelpers|4.0.2`
Parameters: |
Name | Type | Min | Max | In/Out
--- | --- | --- | --- | ---
Patient | Patient | 0 | 1 | Out
Data Requirements: |
Type | Profile | MS | Code Filter
--- | --- | --- | ---
Patient | http://hl7.org/fhir/StructureDefinition/Patient |  |
Location | http://hl7.org/fhir/StructureDefinition/Location | ; |
Content: text/cql
    library NHSNHelpers version '0.0.002'

    using FHIR version '4.0.1'

    include FHIRHelpers version '4.0.2'

    context Patient

    define function "Normalize Interval"(choice Choice<FHIR.dateTime, FHIR.Period, FHIR.Timing, FHIR.instant, FHIR.string, FHIR.Age, FHIR.Range>):
      case
    	  when choice is FHIR.dateTime then
        	Interval[FHIRHelpers.ToDateTime(choice as FHIR.dateTime), FHIRHelpers.ToDateTime(choice as FHIR.dateTime)]
    		when choice is FHIR.Period then
      		FHIRHelpers.ToInterval(choice as FHIR.Period)
    		when choice is FHIR.instant then
    			Interval[FHIRHelpers.ToDateTime(choice as FHIR.instant), FHIRHelpers.ToDateTime(choice as FHIR.instant)]
    		when choice is FHIR.Age then
    		  Interval[FHIRHelpers.ToDate(Patient.birthDate) + FHIRHelpers.ToQuantity(choice as FHIR.Age),
    			  FHIRHelpers.ToDate(Patient.birthDate) + FHIRHelpers.ToQuantity(choice as FHIR.Age) + 1 year)
    		when choice is FHIR.Range then
    		  Interval[FHIRHelpers.ToDate(Patient.birthDate) + FHIRHelpers.ToQuantity((choice as FHIR.Range).low),
    			  FHIRHelpers.ToDate(Patient.birthDate) + FHIRHelpers.ToQuantity((choice as FHIR.Range).high) + 1 year)
    		when choice is FHIR.Timing then
    		  Message(null as Interval<DateTime>, true, '1', 'Error', 'Cannot compute a single interval from a Timing type')
        when choice is FHIR.string then
          Message(null as Interval<DateTime>, true, '1', 'Error', 'Cannot compute an interval from a String value')
    		else
    			null as Interval<DateTime>
    	end

    define function "ToDateInterval"(period FHIR.Period):
      Interval[date from period.start, date from period.end]

    define function "GetLocation"(reference Reference ):
      singleton from (
    	[Location] Locations
    		where Locations.id = GetId(reference.reference)
      )

    define function "GetId"(uri String ):
      Last(Split(uri, '/'))