Colonoscopy with an external service provider

{
  "resourceType" : "Encounter",
  "id" : "colonoscopy",
  "status" : "completed",
  "class" : [{
    "coding" : [{
      "system" : "http://terminology.hl7.org/CodeSystem/v3-ActCode",
      "code" : "IMP",
      "display" : "inpatient encounter"
    }]
  }],
  "type" : [{
    "coding" : [{
      "system" : "http://snomed.info/sct",
      "code" : "73761001",
      "display" : "Colonoscopy (procedure)"
    }],
    "text" : "Colonoscopy"
  }],
  "subject" : {
    "reference" : "Patient/glossy",
    "display" : "Henry Levin the 7th"
  },
  "serviceProvider" : {
    "reference" : "Organization/1",
    "display" : "Gastroenterology @ Acme Hospital"
  },
  "participant" : [{
    "type" : [{
      "coding" : [{
        "system" : "http://terminology.hl7.org/CodeSystem/v3-ParticipationType",
        "code" : "PART"
      }]
    }],
    "actor" : {
      "reference" : "Practitioner/example",
      "display" : "Dr Adam Careful"
    }
  }],
  "actualPeriod" : {
    "start" : "2013-03-11",
    "end" : "2013-03-20"
  },
  "reason" : [{
    "value" : [{
      "concept" : {
        "text" : "Routine investigation"
      }
    }]
  }]
}