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: MedicationRequest Cumulative Duration - JSON Representation

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// 
This example MedicationRequest models QDM Medication, Order. Cooking with CQL session 49 discusses how to calculate cumulative medication duration:
https://github.com/cqframework/CQL-Formatting-and-Usage-Wiki/blob/master/Source/Cooking%20With%20CQL/49/36_CumulativeMedicationDuration.cql

The cumulative medication duration in this example would be calculated as:
(supply * (1 + refills )) / (dosage * frequency)
(100 * (1 + 2)) / (5 * 3) = 20 days

See the QDM to QI-Core mapping for details regarding QDM data attribute representation in FHIR.
http://hl7.org/fhir/us/qicore/qdm-to-qicore.html

{
  "resourceType" : "MedicationRequest",
  "id" : "cmd-example",
  "meta" : {
    "profile" : [
      🔗 "http://hl7.org/fhir/us/qicore/StructureDefinition/qicore-medicationrequest"
    ]
  },
  "text" : {
    "status" : "generated",
    "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p class=\"res-header-id\"><b>Generated Narrative: MedicationRequest cmd-example</b></p><a name=\"cmd-example\"> </a><a name=\"hccmd-example\"> </a><a name=\"cmd-example-en-US\"> </a><p><b>status</b>: Active</p><p><b>intent</b>: Order</p><p><b>medication</b>: <a href=\"Medication-example.html\">Medication alemtuzumab 10 MG/ML [Lemtrada]</a></p><p><b>subject</b>: <a href=\"Patient-example.html\">Jim Chalmers  Male, DoB: 1974-12-25 ( Medical record number\u00a0(use:\u00a0usual,\u00a0period:\u00a02001-05-06 --&gt; (ongoing)))</a></p><p><b>authoredOn</b>: 2015-03-25 19:32:52-0500</p><p><b>requester</b>: <a href=\"Practitioner-example.html\">Practitioner Adam Careful </a></p><blockquote><p><b>dosageInstruction</b></p></blockquote><h3>DispenseRequests</h3><table class=\"grid\"><tr><td style=\"display: none\">-</td><td><b>NumberOfRepeatsAllowed</b></td><td><b>Quantity</b></td></tr><tr><td style=\"display: none\">*</td><td>2</td><td>100 ml<span style=\"background: LightGoldenRodYellow\"> (Details: UCUM  codeml = 'ml')</span></td></tr></table></div>"
  },
  "status" : "active",
  "intent" : "order",
  "medicationReference" : {
    🔗 "reference" : "Medication/example"
  },
  "subject" : {
    🔗 "reference" : "Patient/example"
  },
  "authoredOn" : "2015-03-25T19:32:52-05:00",
  "requester" : {
    🔗 "reference" : "Practitioner/example"
  },
  "dosageInstruction" : [
    {
      "timing" : {
        "repeat" : {
          "frequency" : 3,
          "period" : 1,
          "periodUnit" : "d"
        }
      },
      "site" : {
        "coding" : [
          {
            "system" : "http://snomed.info/sct",
            "code" : "447964005"
          }
        ]
      },
      "route" : {
        "coding" : [
          {
            "system" : "http://snomed.info/sct",
            "code" : "394899003",
            "display" : "oral administration of treatment"
          }
        ]
      },
      "doseAndRate" : [
        {
          "type" : {
            "coding" : [
              {
                "system" : "http://terminology.hl7.org/CodeSystem/dose-rate-type",
                "code" : "ordered",
                "display" : "Ordered"
              }
            ]
          },
          "doseQuantity" : {
            "value" : 5,
            "unit" : "ml",
            "system" : "http://unitsofmeasure.org",
            "code" : "ml"
          }
        }
      ]
    }
  ],
  "dispenseRequest" : {
    "numberOfRepeatsAllowed" : 2,
    "quantity" : {
      "value" : 100,
      "unit" : "ml",
      "system" : "http://unitsofmeasure.org",
      "code" : "ml"
    }
  }
}