Request for Intravenous Antibiotic with a Dosage Rate - Piperacillin - completed with reason code

{
  "resourceType" : "MedicationRequest",
  "id" : "medrx0319",
  "contained" : [{
    "resourceType" : "Medication",
    "id" : "med0302",
    "code" : {
      "coding" : [{
        "system" : "http://hl7.org/fhir/sid/ndc",
        "code" : "0206-8862-02",
        "display" : "Zosyn in Galaxy Containers, 12 BAG in 1 BOX (0206-8862-02) > 100 mL in 1 BAG (0206-8862-01) (package)"
      }],
      "text" : "Zosyn (piperacillin/tazobactam) 4.5gm injection"
    }
  }],
  "identifier" : [{
    "use" : "official",
    "system" : "http://www.bmc.nl/portal/prescriptions",
    "value" : "12345689"
  }],
  "status" : "completed",
  "intent" : "order",
  "medication" : {
    "reference" : {
      "reference" : "#med0302",
      "display" : "Piperacillin/Tazobactam 4.5gm"
    }
  },
  "subject" : {
    "reference" : "Patient/pat1",
    "display" : "Donald Duck"
  },
  "authoredOn" : "2015-01-15",
  "requester" : {
    "reference" : "Practitioner/f007",
    "display" : "Patrick Pump"
  },
  "reason" : [{
    "concept" : {
      "coding" : [{
        "system" : "http://snomed.info/sct",
        "code" : "385093006",
        "display" : "Community acquired pneumonia (disorder)"
      }]
    }
  }],
  "dosageInstruction" : {
    "step" : [{
      "component" : [{
        "text" : "4.5 grams in D5W 250 ml. IV every 6 hours.Infuse over 30 min at 8L/min ",
        "timing" : {
          "repeat" : {
            "frequency" : 1,
            "period" : 6,
            "periodUnit" : "h"
          }
        },
        "route" : {
          "coding" : [{
            "system" : "http://snomed.info/sct",
            "code" : "47625008",
            "display" : "Intravenous route"
          }]
        },
        "doseAndRate" : [{
          "type" : {
            "coding" : [{
              "system" : "http://terminology.hl7.org/CodeSystem/dose-rate-type",
              "code" : "ordered",
              "display" : "Ordered"
            }]
          },
          "doseQuantity" : {
            "value" : 4.5,
            "unit" : "g",
            "system" : "http://unitsofmeasure.org",
            "code" : "g"
          },
          "rateQuantity" : {
            "value" : 50,
            "system" : "http://unitsofmeasure.org",
            "code" : "ml/h"
          }
        }]
      }]
    }]
  }
}