Real-world encounter example (with primaryDiagnosis extension added)

{
  "resourceType" : "Encounter",
  "id" : "f202",
  "identifier" : [{
    "use" : "temp",
    "value" : "Encounter_Roel_20130128"
  }],
  "status" : "completed",
  "class" : [{
    "coding" : [{
      "system" : "http://terminology.hl7.org/CodeSystem/v3-ActCode",
      "code" : "AMB",
      "display" : "ambulatory"
    }]
  }],
  "priority" : {
    "coding" : [{
      "system" : "http://snomed.info/sct",
      "code" : "103391001",
      "display" : "Urgent"
    }]
  },
  "type" : [{
    "coding" : [{
      "system" : "http://snomed.info/sct",
      "code" : "367336001",
      "display" : "Chemotherapy"
    }]
  }],
  "subject" : {
    "reference" : "Patient/f201",
    "display" : "Roel"
  },
  "serviceProvider" : {
    "reference" : "Organization/f201"
  },
  "participant" : [{
    "actor" : {
      "reference" : "Practitioner/f201"
    }
  }],
  "length" : {
    "value" : 56,
    "unit" : "minutes",
    "system" : "http://unitsofmeasure.org",
    "code" : "min"
  },
  "reason" : [{
    "value" : [{
      "concept" : {
        "text" : "The patient is treated for a tumor."
      }
    }]
  }],
  "diagnosis" : [{
    "condition" : [{
      "concept" : {
        "text" : "Complications from Roel's TPF chemotherapy on January 28th, 2013"
      }
    }],
    "use" : [{
      "coding" : [{
        "system" : "http://terminology.hl7.org/CodeSystem/diagnosis-role",
        "code" : "AD",
        "display" : "Admission diagnosis"
      }]
    }]
  },
  {
    "condition" : [{
      "concept" : {
        "text" : "The patient is treated for a tumor"
      }
    }],
    "use" : [{
      "coding" : [{
        "system" : "http://terminology.hl7.org/CodeSystem/diagnosis-role",
        "code" : "CC",
        "display" : "Chief complaint"
      }]
    }]
  }]
}