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FHIR IG analytics

Packagehl7.fhir.uv.cqm
Resource TypeMeasure
IdMeasure-EXM55-FHIR.json
FHIR VersionR4
Sourcehttps://build.fhir.org/ig/HL7/fhir-cqm/Measure-EXM55-FHIR.html
URLhttp://hl7.org/fhir/uv/cqm/Measure/EXM55-FHIR
Version5.0.0
Statusactive
Date2025-08-13
NameEXM55
TitleEXM55 - Median Emergency Department Visit Duration
Realmuv
Authorityhl7
DescriptionThis example illustrates a continuous variable measure represented as a FHIR eCQM

Resources that use this resource

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Resources that this resource uses

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Narrative

Note: links and images are rebased to the (stated) source

Metadata
Title EXM55 - Median Emergency Department Visit Duration
Version 5.0.0
Identifier 55
Identifier urn:oid:2.16.840.1.113883.4.642.40.61.29.8
Effective Period 2018-01-01 through 2018-12-31
Approval Date 2019-03-08
Last Review Date 2019-03-08
Experimental true
Use Context Clinical Venue = EH
Jurisdiction Global (Whole world)
Topic Health Quality Measure Document
Steward (Publisher) HL7 International / Clinical Quality Information
Description

This example illustrates a continuous variable measure represented as a FHIR eCQM
Measure Basis Encounter
Measure Scoring Continuous Variable
Measure Type Process
Improvement Notation Decreased score indicates improvement
Measure Group (Rate) (ID: primary)
Initial Population ID: primary-exm55-initial-population
Description: No description provided Criteria: Initial Population
Measure Population ID: primary-exm55-measure-population
Description: No description provided Criteria: Measure Population
Measure Population Exclusion ID: primary-exm55-measure-population-exclusion
Description: No description provided Criteria: Measure Population Exclusion
Measure Observation ID: primary-exm55-measure-population-identifier
Description: No description provided Criteria: Measure Observation
Input Population: measure-population-identifier AggregateMethod: median
Stratifier Code: Stratification 1
Stratifier Code: Stratification 2
Stratifier Code: Stratification 3
Measure Logic
Primary Library EXM55 - Median Emergency Department Visit Duration Library (Example Continuous Variable Measure Library)
Contents Population Criteria
Logic Definitions
Terminology
Dependencies
Data Requirements
Population Criteria
Measure Group (Rate) (ID: primary)
Initial Population 
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
Definition
Measure Population 
define "Measure Population" :
  "Initial Population"
Definition
Measure Population Exclusion 
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"
Definition
Measure Observation 
define function "Measure Observation" (Encounter "Encounter" ) :
  duration in minutes of "Related ED Visit"(Encounter).period
Definition
Stratifier 
define "Stratification 1" :
  "Inpatient Encounter" Encounter
    where not (PrincipalDiagnosis(Encounter).code in "Psychiatric/Mental Health Patient")
Definition
Stratifier 
define "Stratification 2" :
  "Inpatient Encounter" Encounter
    where PrincipalDiagnosis(Encounter).code in "Psychiatric/Mental Health Patient"
Definition
Stratifier 
define "Stratification 3" :
  "Inpatient Encounter" Encounter
    where PrincipalDiagnosis(Encounter) is null
Definition
Logic Definitions
Logic Definition Library Name: FHIRHelpers 
/*
@description: Converts the given [Period](https://hl7.org/fhir/datatypes.html#Period)
value to a CQL DateTime Interval
@comment: If the start value of the given period is unspecified, the starting
boundary of the resulting interval will be open (meaning the start of the interval
is unknown, as opposed to interpreted as the beginning of time).
*/
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]
Logic Definition Library Name: FHIRHelpers 
/*
@description: Converts the given FHIR [CodeableConcept](https://hl7.org/fhir/datatypes.html#CodeableConcept) value to a CQL Concept.
*/
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
        }
Logic Definition Library Name: FHIRHelpers 
/*
@description: Converts the given FHIR [Coding](https://hl7.org/fhir/datatypes.html#Coding) value to a CQL Code.
*/
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
        }
Logic Definition Library Name: FHIRHelpers 
define function ToString(value string): value.value
Logic Definition Library Name: FHIRHelpers 
define function ToString(value EncounterStatus): value.value
Logic Definition Library Name: EXM55 
define "Inpatient Encounter" :
  ["Encounter"] Encounter
    where LengthInDays(Encounter.period) <= 120
      and Encounter.period ends during "Measurement Period"
Logic Definition Library Name: EXM55 
define "Stratification 3" :
  "Inpatient Encounter" Encounter
    where PrincipalDiagnosis(Encounter) is null
Logic Definition Library Name: EXM55 
define "Stratification 2" :
  "Inpatient Encounter" Encounter
    where PrincipalDiagnosis(Encounter).code in "Psychiatric/Mental Health Patient"
Logic Definition Library Name: EXM55 
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"
Logic Definition Library Name: EXM55 
define "Stratification 1" :
  "Inpatient Encounter" Encounter
    where not (PrincipalDiagnosis(Encounter).code in "Psychiatric/Mental Health Patient")
Logic Definition Library Name: EXM55 
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
Logic Definition Library Name: EXM55 
define "Measure Population" :
  "Initial Population"
Logic Definition Library Name: EXM55 
define function "LengthInDays"(Value Interval<DateTime>):
	difference in days between start of Value and end of Value
Logic Definition Library Name: EXM55 
define function "PrincipalDiagnosis"(Encounter Encounter):
	(singleton from (Encounter.diagnosis D where D.use ~ ToConcept("Billing") and D.rank.value = 1)) PD
		return singleton from ([Condition: id in "GetId"(PD.condition.reference)])
Logic Definition Library Name: EXM55 
define function "GetId"(uri String):
	Last(Split(uri, '/'))
Logic Definition Library Name: EXM55 
define function "Measure Observation" (Encounter "Encounter" ) :
  duration in minutes of "Related ED Visit"(Encounter).period
Logic Definition Library Name: EXM55 
//Measure Observation
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 )
Terminology
Code System Description: Code system Diagnosis Role
Resource: Diagnosis Role
Canonical URL: http://terminology.hl7.org/CodeSystem/diagnosis-role
Value Set Description: Value set Psychiatric/Mental Health Patient
Resource: Psychiatric/Mental Health Diagnosis
Canonical URL: http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.3.117.1.7.1.299
Value Set Description: Value set Emergency Department Visit
Resource: Emergency Department Visit
Canonical URL: http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.3.117.1.7.1.292
Value Set Description: Value set Hospital Settings
Resource: Hospital Settings
Canonical URL: http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113762.1.4.1111.126
Direct Reference Code Display: Billing
Code: billing
System: http://terminology.hl7.org/CodeSystem/diagnosis-role
Dependencies
Dependency Description: Library FHIRHelpers
Resource: http://hl7.org/fhir/uv/cql/Library/FHIRHelpers|4.0.1
Canonical URL: http://hl7.org/fhir/uv/cql/Library/FHIRHelpers|4.0.1
Data Requirements
Data Requirement Type: Encounter
Profile(s): Encounter
Must Support Elements: period, use, rank, rank.value, condition, condition.reference
Data Requirement Type: Encounter
Profile(s): Encounter
Must Support Elements: type, period, status, hospitalization, hospitalization.admitSource, use, rank, rank.value, condition, condition.reference
Code Filter(s):
Path: type
ValueSet: Emergency Department Visit
Data Requirement Type: Condition
Profile(s): Condition
Must Support Elements: id
Code Filter(s):
Path: id
Generated using version 0.4.9 of the sample-content-ig Liquid templates

Source1

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      "http://hl7.org/fhir/uv/crmi/StructureDefinition/crmi-shareablemeasure"
    ]
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  "text": {
    "status": "extensions",
    "div": "<!-- snip (see above) -->"
  },
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            },
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              "valueInteger": 1
            }
          ],
          "url": "http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition"
        },
        {
          "extension": [
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              "valueString": "EXM55"
            },
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              "url": "name",
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          ],
          "url": "http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition"
        },
        {
          "extension": [
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            },
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              "url": "name",
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              "url": "statement",
              "valueString": "define \"Measure Population Exclusion\" :\n  \"Inpatient Encounter\" Encounter\n    with [\"Encounter\" : \"Emergency Department Visit\"] ED\n      such that ED.period ends 1 hour or less before start of Encounter.period\n        and ED.status = 'finished'\n        and ED.hospitalization.admitSource in \"Hospital Settings\""
            },
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            }
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        },
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          "extension": [
            {
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            },
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              "url": "name",
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            },
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          ],
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            {
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            },
            {
              "url": "statement",
              "valueString": "/*\n@description: Converts the given [Period](https://hl7.org/fhir/datatypes.html#Period)\nvalue to a CQL DateTime Interval\n@comment: If the start value of the given period is unspecified, the starting\nboundary of the resulting interval will be open (meaning the start of the interval\nis unknown, as opposed to interpreted as the beginning of time).\n*/\ndefine function ToInterval(period FHIR.Period):\n    if period is null then\n        null\n    else\n        if period.\"start\" is null then\n            Interval(period.\"start\".value, period.\"end\".value]\n        else\n            Interval[period.\"start\".value, period.\"end\".value]"
            },
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              "url": "displaySequence",
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          ],
          "url": "http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition"
        },
        {
          "extension": [
            {
              "url": "libraryName",
              "valueString": "EXM55"
            },
            {
              "url": "name",
              "valueString": "PrincipalDiagnosis"
            },
            {
              "url": "statement",
              "valueString": "define function \"PrincipalDiagnosis\"(Encounter Encounter):\n\t(singleton from (Encounter.diagnosis D where D.use ~ ToConcept(\"Billing\") and D.rank.value = 1)) PD\n\t\treturn singleton from ([Condition: id in \"GetId\"(PD.condition.reference)])"
            },
            {
              "url": "displaySequence",
              "valueInteger": 9
            }
          ],
          "url": "http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition"
        },
        {
          "extension": [
            {
              "url": "libraryName",
              "valueString": "FHIRHelpers"
            },
            {
              "url": "name",
              "valueString": "ToConcept"
            },
            {
              "url": "statement",
              "valueString": "/*\n@description: Converts the given FHIR [CodeableConcept](https://hl7.org/fhir/datatypes.html#CodeableConcept) value to a CQL Concept.\n*/\ndefine function ToConcept(concept FHIR.CodeableConcept):\n    if concept is null then\n        null\n    else\n        System.Concept {\n            codes: concept.coding C return ToCode(C),\n            display: concept.text.value\n        }"
            },
            {
              "url": "displaySequence",
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            },
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        },
        {
          "extension": [
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              "url": "libraryName",
              "valueString": "EXM55"
            },
            {
              "url": "name",
              "valueString": "GetId"
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            {
              "url": "statement",
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            },
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            }
          ],
          "url": "http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition"
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            {
              "url": "name",
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        },
        {
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            },
            {
              "url": "name",
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            },
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            }
          ],
          "url": "http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition"
        },
        {
          "extension": [
            {
              "url": "libraryName",
              "valueString": "EXM55"
            },
            {
              "url": "name",
              "valueString": "Measure Observation"
            },
            {
              "url": "statement",
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            },
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            }
          ],
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        },
        {
          "extension": [
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              "url": "libraryName",
              "valueString": "EXM55"
            },
            {
              "url": "name",
              "valueString": "Related ED Visit"
            },
            {
              "url": "statement",
              "valueString": "//Measure Observation\ndefine function \"Related ED Visit\" (Encounter \"Encounter\" ) :\n  Last([\"Encounter\" : \"Emergency Department Visit\"] ED\n    where ED.status = 'finished'\n      and ED.period ends 1 hour or less before start of Encounter.period\n    sort by start of period )"
            },
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              "url": "displaySequence",
              "valueInteger": 16
            }
          ],
          "url": "http://hl7.org/fhir/StructureDefinition/cqf-logicDefinition"
        }
      ],
      "name": "EffectiveDataRequirements",
      "status": "active",
      "type": {
        "coding": [
          {
            "system": "http://terminology.hl7.org/CodeSystem/library-type",
            "code": "module-definition"
          }
        ]
      },
      "relatedArtifact": [
        {
          "type": "depends-on",
          "display": "Library FHIRHelpers",
          "resource": "http://hl7.org/fhir/uv/cql/Library/FHIRHelpers|4.0.1"
        },
        {
          "type": "depends-on",
          "display": "Code system Diagnosis Role",
          "resource": "http://terminology.hl7.org/CodeSystem/diagnosis-role"
        },
        {
          "type": "depends-on",
          "display": "Value set Psychiatric/Mental Health Patient",
          "resource": "http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.3.117.1.7.1.299"
        },
        {
          "type": "depends-on",
          "display": "Value set Emergency Department Visit",
          "resource": "http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.3.117.1.7.1.292"
        },
        {
          "type": "depends-on",
          "display": "Value set Hospital Settings",
          "resource": "http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113762.1.4.1111.126"
        }
      ],
      "parameter": [
        {
          "name": "Measurement Period",
          "use": "in",
          "min": 0,
          "max": "1",
          "type": "Period"
        },
        {
          "name": "Stratification 3",
          "use": "out",
          "min": 0,
          "max": "*",
          "type": "Encounter"
        },
        {
          "name": "Stratification 2",
          "use": "out",
          "min": 0,
          "max": "*",
          "type": "Encounter"
        },
        {
          "name": "Measure Population Exclusion",
          "use": "out",
          "min": 0,
          "max": "*",
          "type": "Encounter"
        },
        {
          "name": "Stratification 1",
          "use": "out",
          "min": 0,
          "max": "*",
          "type": "Encounter"
        },
        {
          "name": "Initial Population",
          "use": "out",
          "min": 0,
          "max": "*",
          "type": "Encounter"
        },
        {
          "name": "Measure Population",
          "use": "out",
          "min": 0,
          "max": "*",
          "type": "Encounter"
        }
      ],
      "dataRequirement": [
        {
          "type": "Encounter",
          "profile": [
            "http://hl7.org/fhir/StructureDefinition/Encounter"
          ],
          "mustSupport": [
            "period",
            "use",
            "rank",
            "rank.value",
            "condition",
            "condition.reference"
          ]
        },
        {
          "type": "Encounter",
          "profile": [
            "http://hl7.org/fhir/StructureDefinition/Encounter"
          ],
          "mustSupport": [
            "type",
            "period",
            "status",
            "hospitalization",
            "hospitalization.admitSource",
            "use",
            "rank",
            "rank.value",
            "condition",
            "condition.reference"
          ],
          "codeFilter": [
            {
              "path": "type",
              "valueSet": "http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.3.117.1.7.1.292"
            }
          ]
        },
        {
          "type": "Condition",
          "profile": [
            "http://hl7.org/fhir/StructureDefinition/Condition"
          ],
          "mustSupport": [
            "id"
          ],
          "codeFilter": [
            {
              "path": "id"
            }
          ]
        }
      ]
    }
  ],
  "extension": [
    {
      "url": "http://hl7.org/fhir/uv/cqm/StructureDefinition/cqm-populationBasis",
      "valueCode": "Encounter"
    },
    {
      "url": "http://hl7.org/fhir/uv/crmi/StructureDefinition/crmi-softwaresystem",
      "valueReference": {
        "reference": "Device/software-system-example"
      }
    },
    {
      "id": "effective-data-requirements",
      "url": "http://hl7.org/fhir/uv/crmi/StructureDefinition/crmi-effectiveDataRequirements",
      "valueCanonical": "#effective-data-requirements"
    }
  ],
  "url": "http://hl7.org/fhir/uv/cqm/Measure/EXM55-FHIR",
  "identifier": [
    {
      "use": "official",
      "system": "http://example.org/fhir/cqi/ecqm/Measure/Identifier/exm",
      "value": "55"
    },
    {
      "system": "urn:ietf:rfc:3986",
      "value": "urn:oid:2.16.840.1.113883.4.642.40.61.29.8"
    }
  ],
  "version": "5.0.0",
  "name": "EXM55",
  "title": "EXM55 - Median Emergency Department Visit Duration",
  "status": "active",
  "experimental": true,
  "date": "2025-08-13",
  "publisher": "HL7 International / Clinical Quality Information",
  "contact": [
    {
      "telecom": [
        {
          "system": "url",
          "value": "http://www.hl7.org/Special/committees/cqi"
        }
      ]
    }
  ],
  "description": "This example illustrates a continuous variable measure represented as a FHIR eCQM",
  "useContext": [
    {
      "code": {
        "system": "http://terminology.hl7.org/CodeSystem/usage-context-type",
        "code": "venue",
        "display": "Clinical Venue"
      },
      "valueCodeableConcept": {
        "coding": [
          {
            "system": "http://hl7.org/fhir/uv/cqm/CodeSystem/intended-venue-codes",
            "code": "eh",
            "display": "EH"
          }
        ]
      }
    }
  ],
  "jurisdiction": [
    {
      "coding": [
        {
          "system": "http://unstats.un.org/unsd/methods/m49/m49.htm",
          "code": "001"
        }
      ]
    }
  ],
  "approvalDate": "2019-03-08",
  "lastReviewDate": "2019-03-08",
  "effectivePeriod": {
    "start": "2018-01-01",
    "end": "2018-12-31"
  },
  "topic": [
    {
      "coding": [
        {
          "system": "http://loinc.org",
          "code": "57024-2",
          "display": "Health Quality Measure Document"
        }
      ]
    }
  ],
  "library": [
    "http://hl7.org/fhir/uv/cqm/Library/EXM55"
  ],
  "scoring": {
    "coding": [
      {
        "system": "http://terminology.hl7.org/CodeSystem/measure-scoring",
        "code": "continuous-variable",
        "display": "Continuous Variable"
      }
    ]
  },
  "type": [
    {
      "coding": [
        {
          "system": "http://terminology.hl7.org/CodeSystem/measure-type",
          "code": "process"
        }
      ]
    }
  ],
  "improvementNotation": {
    "coding": [
      {
        "system": "http://terminology.hl7.org/CodeSystem/measure-improvement-notation",
        "code": "decrease",
        "display": "Decreased score indicates improvement"
      }
    ]
  },
  "group": [
    {
      "id": "group-1",
      "extension": [
        {
          "url": "http://hl7.org/fhir/5.0/StructureDefinition/extension-Measure.group.linkId",
          "valueString": "primary"
        }
      ],
      "population": [
        {
          "extension": [
            {
              "url": "http://hl7.org/fhir/5.0/StructureDefinition/extension-Measure.group.population.linkId",
              "valueString": "primary-exm55-initial-population"
            }
          ],
          "code": {
            "coding": [
              {
                "system": "http://terminology.hl7.org/CodeSystem/measure-population",
                "code": "initial-population",
                "display": "Initial Population"
              }
            ]
          },
          "criteria": {
            "language": "text/cql-identifier",
            "expression": "Initial Population"
          }
        },
        {
          "extension": [
            {
              "url": "http://hl7.org/fhir/5.0/StructureDefinition/extension-Measure.group.population.linkId",
              "valueString": "primary-exm55-measure-population"
            }
          ],
          "code": {
            "coding": [
              {
                "system": "http://terminology.hl7.org/CodeSystem/measure-population",
                "code": "measure-population",
                "display": "Measure Population"
              }
            ]
          },
          "criteria": {
            "language": "text/cql-identifier",
            "expression": "Measure Population"
          }
        },
        {
          "extension": [
            {
              "url": "http://hl7.org/fhir/5.0/StructureDefinition/extension-Measure.group.population.linkId",
              "valueString": "primary-exm55-measure-population-exclusion"
            }
          ],
          "code": {
            "coding": [
              {
                "system": "http://terminology.hl7.org/CodeSystem/measure-population",
                "code": "measure-population-exclusion",
                "display": "Measure Population Exclusion"
              }
            ]
          },
          "criteria": {
            "language": "text/cql-identifier",
            "expression": "Measure Population Exclusion"
          }
        },
        {
          "extension": [
            {
              "url": "http://hl7.org/fhir/5.0/StructureDefinition/extension-Measure.group.population.linkId",
              "valueString": "primary-exm55-measure-population-identifier"
            },
            {
              "url": "http://hl7.org/fhir/StructureDefinition/cqf-criteriaReference",
              "valueString": "measure-population-identifier"
            },
            {
              "url": "http://hl7.org/fhir/uv/cqm/StructureDefinition/cqm-aggregateMethod",
              "valueCode": "median"
            }
          ],
          "code": {
            "coding": [
              {
                "system": "http://terminology.hl7.org/CodeSystem/measure-population",
                "code": "measure-observation",
                "display": "Measure Observation"
              }
            ]
          },
          "criteria": {
            "language": "text/cql-identifier",
            "expression": "Measure Observation"
          }
        }
      ],
      "stratifier": [
        {
          "extension": [
            {
              "url": "http://hl7.org/fhir/5.0/StructureDefinition/extension-Measure.group.stratifier.linkId",
              "valueString": "primary-exm55-stratification-1"
            },
            {
              "url": "http://hl7.org/fhir/uv/cqm/StructureDefinition/cqm-appliesTo",
              "valueCodeableConcept": {
                "coding": [
                  {
                    "system": "http://terminology.hl7.org/CodeSystem/measure-population",
                    "code": "initial-population",
                    "display": "Initial Population"
                  }
                ]
              }
            }
          ],
          "code": {
            "coding": [
              {
                "system": "http://example.org/stratification",
                "code": "Stratification 1",
                "display": "Stratification 1"
              }
            ]
          },
          "criteria": {
            "language": "text/cql-identifier",
            "expression": "Stratification 1"
          }
        },
        {
          "extension": [
            {
              "url": "http://hl7.org/fhir/5.0/StructureDefinition/extension-Measure.group.stratifier.linkId",
              "valueString": "primary-exm55-stratificatio-2"
            },
            {
              "url": "http://hl7.org/fhir/uv/cqm/StructureDefinition/cqm-appliesTo",
              "valueCodeableConcept": {
                "coding": [
                  {
                    "system": "http://terminology.hl7.org/CodeSystem/measure-population",
                    "code": "initial-population",
                    "display": "Initial Population"
                  }
                ]
              }
            }
          ],
          "code": {
            "coding": [
              {
                "system": "http://example.org/stratification",
                "code": "Stratification 2",
                "display": "Stratification 2"
              }
            ]
          },
          "criteria": {
            "language": "text/cql-identifier",
            "expression": "Stratification 2"
          }
        },
        {
          "extension": [
            {
              "url": "http://hl7.org/fhir/5.0/StructureDefinition/extension-Measure.group.stratifier.linkId",
              "valueString": "primary-exm55-stratification-3"
            },
            {
              "url": "http://hl7.org/fhir/uv/cqm/StructureDefinition/cqm-appliesTo",
              "valueCodeableConcept": {
                "coding": [
                  {
                    "system": "http://terminology.hl7.org/CodeSystem/measure-population",
                    "code": "initial-population",
                    "display": "Initial Population"
                  }
                ]
              }
            }
          ],
          "code": {
            "coding": [
              {
                "system": "http://example.org/stratification",
                "code": "Stratification 3",
                "display": "Stratification 3"
              }
            ]
          },
          "criteria": {
            "language": "text/cql-identifier",
            "expression": "Stratification 3"
          }
        }
      ]
    }
  ]
}