FHIR to OMOP FHIR IG
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FHIR to OMOP FHIR IG, published by HL7 International / Biomedical Research and Regulation. This guide is not an authorized publication; it is the continuous build for version 2.0.0-ballot built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/HL7/fhir-omop-ig/ and changes regularly. See the Directory of published versions

Logical Model: Condition Era OMOP Table - JSON Profile

Page standards status: Trial-use Maturity Level: 2

JSON representation of the ConditionEra logical model.

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{
  "resourceType" : "StructureDefinition",
  "id" : "ConditionEra",
  "language" : "en",
  "text" : {
    "status" : "extensions",
    "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\"><p class=\"res-header-id\"><b>Generated Narrative: StructureDefinition ConditionEra</b></p><table border=\"0\" cellpadding=\"0\" cellspacing=\"0\" class=\"xhtTableBorder0\"><tr class=\"xhtRowBorder1\"><th scope=\"col\" style=\"\" class=\"hierarchy xhtCellBorder0\"><a href=\"https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views\" title=\"The logical name of the element\">Name</a></th><th scope=\"col\" style=\"\" class=\"hierarchy xhtCellBorder0\"><a href=\"https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views\" title=\"Information about the use of the element\">Flags</a></th><th scope=\"col\" style=\"\" class=\"hierarchy xhtCellBorder0\"><a href=\"https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views\" title=\"Minimum and Maximum # of times the element can appear in the instance\">Card.</a></th><th scope=\"col\" style=\"; width: 100px\" class=\"hierarchy xhtCellBorder0\"><a href=\"https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views\" title=\"Reference to the type of the element\">Type</a></th><th scope=\"col\" style=\"\" class=\"hierarchy xhtCellBorder0\"><a href=\"https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views\" title=\"Additional information about the element\">Description &amp; Constraints</a><span style=\"float: right\"><a href=\"https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views\" title=\"Legend for this format\"><img src=\"data:image/png;base64,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\" alt=\"doco\" style=\"background-color: inherit\"/></a></span></th></tr><tr class=\"xhtRowBorder0 xhtRowEven\"><td style=\"background-image: url(tbl_bck1.png)\" class=\"hierarchy xhtCellBorder0 xhtCellNoWrap\"><img src=\"tbl_spacer.png\" alt=\"\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"icon_element.gif\" alt=\"\" style=\"background-color: white; background-color: inherit\" title=\"Element\" class=\"hierarchy\"/> <a href=\"StructureDefinition-ConditionEra-definitions.html#ConditionEra\" title=\"A Condition Era is defined as a span of time when the Person is assumed to have a given condition. Similar to Drug Eras, Condition Eras are chronological periods of Condition Occurrence. Combining individual Condition Occurrences into a single Condition Era serves two purposes:\n\n- It allows aggregation of chronic conditions that require frequent ongoing care, instead of treating each Condition Occurrence as an independent event.\n- It allows aggregation of multiple, closely timed doctor visits for the same Condition to avoid double-counting the Condition Occurrences.\nFor example, consider a Person who visits her Primary Care Physician (PCP) and who is referred to a specialist. At a later time, the Person visits the specialist, who confirms the PCP's original diagnosis and provides the appropriate treatment to resolve the condition. These two independent doctor visits should be aggregated into one Condition Era.\">ConditionEra</a><a name=\"ConditionEra\"> </a></td><td style=\"\" class=\"hierarchy xhtCellBorder0\"/><td style=\"\" class=\"hierarchy xhtCellBorder0\"><span class=\"xhtPieceDeEmphasized\">0</span><span class=\"xhtPieceDeEmphasized\">..</span><span class=\"xhtPieceDeEmphasized\">*</span></td><td style=\"\" class=\"hierarchy xhtCellBorder0\"><a href=\"http://hl7.org/fhir/R5/types.html#Base\">Base</a></td><td style=\"\" class=\"hierarchy xhtCellBorder0\">Condition Era OMOP Table<br/><span class=\"xhtPieceBold\">Instances of this type can be the target of a Reference</span></td></tr>\r\n<tr class=\"xhtRowBorder0 xhtRowOdd\"><td style=\"background-image: url(tbl_bck10.png)\" class=\"hierarchy xhtCellBorder0 xhtCellNoWrap\"><img src=\"tbl_spacer.png\" alt=\"\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"tbl_vjoin.png\" alt=\"\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"icon_primitive.png\" alt=\"\" style=\"background-color: #F7F7F7; background-color: inherit\" title=\"Primitive Data Type\" class=\"hierarchy\"/> <span style=\"position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0\" class=\"sr-only\">ConditionEra.</span><a href=\"StructureDefinition-ConditionEra-definitions.html#ConditionEra.condition-era-id\" title=\"Condition Era Identifier\">condition_era_id</a><a name=\"ConditionEra.condition-era-id\"> </a></td><td style=\"\" class=\"hierarchy xhtCellBorder0\"/><td style=\"\" class=\"hierarchy xhtCellBorder0\">1..1</td><td style=\"\" class=\"hierarchy xhtCellBorder0\"><a href=\"http://hl7.org/fhir/R5/datatypes.html#code\">code</a></td><td style=\"\" class=\"hierarchy xhtCellBorder0\">Condition Era Identifier</td></tr>\r\n<tr class=\"xhtRowBorder0 xhtRowEven\"><td style=\"background-image: url(tbl_bck10.png)\" class=\"hierarchy xhtCellBorder0 xhtCellNoWrap\"><img src=\"tbl_spacer.png\" alt=\"\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"tbl_vjoin.png\" alt=\"\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"icon_primitive.png\" alt=\"\" style=\"background-color: white; background-color: inherit\" title=\"Primitive Data Type\" class=\"hierarchy\"/> <span style=\"position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0\" class=\"sr-only\">ConditionEra.</span><a href=\"StructureDefinition-ConditionEra-definitions.html#ConditionEra.person-id\" title=\"Person\">person_id</a><a name=\"ConditionEra.person-id\"> </a></td><td style=\"\" class=\"hierarchy xhtCellBorder0\"/><td style=\"\" class=\"hierarchy xhtCellBorder0\">1..1</td><td style=\"\" class=\"hierarchy xhtCellBorder0\"><a href=\"http://hl7.org/fhir/R5/datatypes.html#integer\">integer</a></td><td style=\"\" class=\"hierarchy xhtCellBorder0\">Person</td></tr>\r\n<tr class=\"xhtRowBorder0 xhtRowOdd\"><td style=\"background-image: url(tbl_bck10.png)\" class=\"hierarchy xhtCellBorder0 xhtCellNoWrap\"><img src=\"tbl_spacer.png\" alt=\"\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"tbl_vjoin.png\" alt=\"\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"icon_primitive.png\" alt=\"\" style=\"background-color: #F7F7F7; background-color: inherit\" title=\"Primitive Data Type\" class=\"hierarchy\"/> <span style=\"position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0\" class=\"sr-only\">ConditionEra.</span><a href=\"StructureDefinition-ConditionEra-definitions.html#ConditionEra.condition-concept-id\" title=\"The Concept Id representing the Condition.\">condition_concept_id</a><a name=\"ConditionEra.condition-concept-id\"> </a></td><td style=\"\" class=\"hierarchy xhtCellBorder0\"/><td style=\"\" class=\"hierarchy xhtCellBorder0\">1..1</td><td style=\"\" class=\"hierarchy xhtCellBorder0\"><a href=\"http://hl7.org/fhir/R5/datatypes.html#code\">code</a></td><td style=\"\" class=\"hierarchy xhtCellBorder0\">Condition</td></tr>\r\n<tr class=\"xhtRowBorder0 xhtRowEven\"><td style=\"background-image: url(tbl_bck10.png)\" class=\"hierarchy xhtCellBorder0 xhtCellNoWrap\"><img src=\"tbl_spacer.png\" alt=\"\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"tbl_vjoin.png\" alt=\"\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"icon_primitive.png\" alt=\"\" style=\"background-color: white; background-color: inherit\" title=\"Primitive Data Type\" class=\"hierarchy\"/> <span style=\"position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0\" class=\"sr-only\">ConditionEra.</span><a href=\"StructureDefinition-ConditionEra-definitions.html#ConditionEra.condition-era-start-date\" title=\"The start date for the Condition Era constructed from the individual instances of Condition Occurrences. It is the start date of the very firstchronologically recorded instance of the condition with at least 31 days since any prior record of the same Condition.\">condition_era_start_date</a><a name=\"ConditionEra.condition-era-start-date\"> </a></td><td style=\"\" class=\"hierarchy xhtCellBorder0\"/><td style=\"\" class=\"hierarchy xhtCellBorder0\">1..1</td><td style=\"\" class=\"hierarchy xhtCellBorder0\"><a href=\"http://hl7.org/fhir/R5/datatypes.html#date\">date</a></td><td style=\"\" class=\"hierarchy xhtCellBorder0\">Condition Era Start Date</td></tr>\r\n<tr class=\"xhtRowBorder0 xhtRowOdd\"><td style=\"background-image: url(tbl_bck10.png)\" class=\"hierarchy xhtCellBorder0 xhtCellNoWrap\"><img src=\"tbl_spacer.png\" alt=\"\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"tbl_vjoin.png\" alt=\"\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"icon_primitive.png\" alt=\"\" style=\"background-color: #F7F7F7; background-color: inherit\" title=\"Primitive Data Type\" class=\"hierarchy\"/> <span style=\"position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0\" class=\"sr-only\">ConditionEra.</span><a href=\"StructureDefinition-ConditionEra-definitions.html#ConditionEra.condition-era-end-date\" title=\"The end date for the Condition Era constructed from the individual instances of Condition Occurrences. It is the end date of the final continuously recorded instance of the Condition.\">condition_era_end_date</a><a name=\"ConditionEra.condition-era-end-date\"> </a></td><td style=\"\" class=\"hierarchy xhtCellBorder0\"/><td style=\"\" class=\"hierarchy xhtCellBorder0\">1..1</td><td style=\"\" class=\"hierarchy xhtCellBorder0\"><a href=\"http://hl7.org/fhir/R5/datatypes.html#code\">code</a></td><td style=\"\" class=\"hierarchy xhtCellBorder0\">Condition Era End Date</td></tr>\r\n<tr class=\"xhtRowBorder0 xhtRowEven\"><td style=\"background-image: url(tbl_bck00.png)\" class=\"hierarchy xhtCellBorder0 xhtCellNoWrap\"><img src=\"tbl_spacer.png\" alt=\"\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"tbl_vjoin_end.png\" alt=\"\" style=\"background-color: inherit\" class=\"hierarchy\"/><img src=\"icon_primitive.png\" alt=\"\" style=\"background-color: white; background-color: inherit\" title=\"Primitive Data Type\" class=\"hierarchy\"/> <span style=\"position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0\" class=\"sr-only\">ConditionEra.</span><a href=\"StructureDefinition-ConditionEra-definitions.html#ConditionEra.condition-occurrence-count\" title=\"The number of individual Condition Occurrences used to construct the\ncondition era.\">condition_occurrence_count</a><a name=\"ConditionEra.condition-occurrence-count\"> </a></td><td style=\"\" class=\"hierarchy xhtCellBorder0\"/><td style=\"\" class=\"hierarchy xhtCellBorder0\">0..1</td><td style=\"\" class=\"hierarchy xhtCellBorder0\"><a href=\"http://hl7.org/fhir/R5/datatypes.html#integer\">integer</a></td><td style=\"\" class=\"hierarchy xhtCellBorder0\">Condition Occurence Count</td></tr>\r\n<tr><td colspan=\"5\" class=\"hierarchy\"><br/><a href=\"https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html#table-views\" title=\"Legend for this format\"><img src=\"data:image/png;base64,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\" alt=\"doco\" style=\"background-color: inherit\"/> Documentation for this format</a></td></tr></table></div>"
  },
  "extension" : [
    {
      "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-type-characteristics",
      "valueCode" : "can-be-target"
    },
    {
      "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
      "valueCode" : "brr"
    },
    {
      "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
      "valueInteger" : 2,
      "_valueInteger" : {
        "extension" : [
          {
            "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom",
            "valueCanonical" : "http://hl7.org/fhir/uv/omop/ImplementationGuide/hl7.fhir.uv.omop"
          }
        ]
      }
    },
    {
      "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
      "valueCode" : "trial-use",
      "_valueCode" : {
        "extension" : [
          {
            "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom",
            "valueCanonical" : "http://hl7.org/fhir/uv/omop/ImplementationGuide/hl7.fhir.uv.omop"
          }
        ]
      }
    }
  ],
  "url" : "http://hl7.org/fhir/uv/omop/StructureDefinition/ConditionEra",
  "identifier" : [
    {
      "system" : "urn:ietf:rfc:3986",
      "value" : "urn:oid:2.16.840.1.113883.4.642.40.77.42.2"
    }
  ],
  "version" : "2.0.0-ballot",
  "name" : "ConditionEra",
  "title" : "Condition Era OMOP Table",
  "status" : "active",
  "date" : "2026-11-06T00:33:48+00:00",
  "publisher" : "HL7 International / Biomedical Research and Regulation",
  "contact" : [
    {
      "name" : "HL7 International / Biomedical Research and Regulation",
      "telecom" : [
        {
          "system" : "url",
          "value" : "http://www.hl7.org/Special/committees/rcrim"
        }
      ]
    }
  ],
  "description" : "A Condition Era is defined as a span of time when the Person is assumed to have a given condition. Similar to Drug Eras, Condition Eras are chronological periods of Condition Occurrence. Combining individual Condition Occurrences into a single Condition Era serves two purposes:\n\n- It allows aggregation of chronic conditions that require frequent ongoing care, instead of treating each Condition Occurrence as an independent event.\n- It allows aggregation of multiple, closely timed doctor visits for the same Condition to avoid double-counting the Condition Occurrences.\nFor example, consider a Person who visits her Primary Care Physician (PCP) and who is referred to a specialist. At a later time, the Person visits the specialist, who confirms the PCP's original diagnosis and provides the appropriate treatment to resolve the condition. These two independent doctor visits should be aggregated into one Condition Era.",
  "jurisdiction" : [
    {
      "coding" : [
        {
          "system" : "http://unstats.un.org/unsd/methods/m49/m49.htm",
          "code" : "001",
          "display" : "World"
        }
      ]
    }
  ],
  "fhirVersion" : "5.0.0",
  "mapping" : [
    {
      "identity" : "rim",
      "uri" : "http://hl7.org/v3",
      "name" : "RIM Mapping"
    }
  ],
  "kind" : "logical",
  "abstract" : false,
  "type" : "http://hl7.org/fhir/uv/omop/StructureDefinition/ConditionEra",
  "baseDefinition" : "http://hl7.org/fhir/StructureDefinition/Base",
  "derivation" : "specialization",
  "snapshot" : {
    "extension" : [
      {
        "url" : "http://hl7.org/fhir/tools/StructureDefinition/snapshot-base-version",
        "valueString" : "5.0.0"
      }
    ],
    "element" : [
      {
        "id" : "ConditionEra",
        "path" : "ConditionEra",
        "short" : "Condition Era OMOP Table",
        "definition" : "A Condition Era is defined as a span of time when the Person is assumed to have a given condition. Similar to Drug Eras, Condition Eras are chronological periods of Condition Occurrence. Combining individual Condition Occurrences into a single Condition Era serves two purposes:\n\n- It allows aggregation of chronic conditions that require frequent ongoing care, instead of treating each Condition Occurrence as an independent event.\n- It allows aggregation of multiple, closely timed doctor visits for the same Condition to avoid double-counting the Condition Occurrences.\nFor example, consider a Person who visits her Primary Care Physician (PCP) and who is referred to a specialist. At a later time, the Person visits the specialist, who confirms the PCP's original diagnosis and provides the appropriate treatment to resolve the condition. These two independent doctor visits should be aggregated into one Condition Era.",
        "min" : 0,
        "max" : "*",
        "base" : {
          "path" : "Base",
          "min" : 0,
          "max" : "*"
        },
        "isModifier" : false,
        "mapping" : [
          {
            "identity" : "rim",
            "map" : "n/a"
          }
        ]
      },
      {
        "id" : "ConditionEra.condition-era-id",
        "path" : "ConditionEra.condition_era_id",
        "short" : "Condition Era Identifier",
        "definition" : "Condition Era Identifier",
        "min" : 1,
        "max" : "1",
        "base" : {
          "path" : "ConditionEra.condition_era_id",
          "min" : 1,
          "max" : "1"
        },
        "type" : [
          {
            "code" : "code"
          }
        ]
      },
      {
        "id" : "ConditionEra.person-id",
        "path" : "ConditionEra.person_id",
        "short" : "Person",
        "definition" : "Person",
        "min" : 1,
        "max" : "1",
        "base" : {
          "path" : "ConditionEra.person_id",
          "min" : 1,
          "max" : "1"
        },
        "type" : [
          {
            "code" : "integer"
          }
        ]
      },
      {
        "id" : "ConditionEra.condition-concept-id",
        "path" : "ConditionEra.condition_concept_id",
        "short" : "Condition",
        "definition" : "The Concept Id representing the Condition.",
        "min" : 1,
        "max" : "1",
        "base" : {
          "path" : "ConditionEra.condition_concept_id",
          "min" : 1,
          "max" : "1"
        },
        "type" : [
          {
            "code" : "code"
          }
        ]
      },
      {
        "id" : "ConditionEra.condition-era-start-date",
        "path" : "ConditionEra.condition_era_start_date",
        "short" : "Condition Era Start Date",
        "definition" : "The start date for the Condition Era constructed from the individual instances of Condition Occurrences. It is the start date of the very firstchronologically recorded instance of the condition with at least 31 days since any prior record of the same Condition.",
        "min" : 1,
        "max" : "1",
        "base" : {
          "path" : "ConditionEra.condition_era_start_date",
          "min" : 1,
          "max" : "1"
        },
        "type" : [
          {
            "code" : "date"
          }
        ]
      },
      {
        "id" : "ConditionEra.condition-era-end-date",
        "path" : "ConditionEra.condition_era_end_date",
        "short" : "Condition Era End Date",
        "definition" : "The end date for the Condition Era constructed from the individual instances of Condition Occurrences. It is the end date of the final continuously recorded instance of the Condition.",
        "min" : 1,
        "max" : "1",
        "base" : {
          "path" : "ConditionEra.condition_era_end_date",
          "min" : 1,
          "max" : "1"
        },
        "type" : [
          {
            "code" : "code"
          }
        ]
      },
      {
        "id" : "ConditionEra.condition-occurrence-count",
        "path" : "ConditionEra.condition_occurrence_count",
        "short" : "Condition Occurence Count",
        "definition" : "The number of individual Condition Occurrences used to construct the\ncondition era.",
        "min" : 0,
        "max" : "1",
        "base" : {
          "path" : "ConditionEra.condition_occurrence_count",
          "min" : 0,
          "max" : "1"
        },
        "type" : [
          {
            "code" : "integer"
          }
        ]
      }
    ]
  },
  "differential" : {
    "element" : [
      {
        "id" : "ConditionEra",
        "path" : "ConditionEra",
        "short" : "Condition Era OMOP Table",
        "definition" : "A Condition Era is defined as a span of time when the Person is assumed to have a given condition. Similar to Drug Eras, Condition Eras are chronological periods of Condition Occurrence. Combining individual Condition Occurrences into a single Condition Era serves two purposes:\n\n- It allows aggregation of chronic conditions that require frequent ongoing care, instead of treating each Condition Occurrence as an independent event.\n- It allows aggregation of multiple, closely timed doctor visits for the same Condition to avoid double-counting the Condition Occurrences.\nFor example, consider a Person who visits her Primary Care Physician (PCP) and who is referred to a specialist. At a later time, the Person visits the specialist, who confirms the PCP's original diagnosis and provides the appropriate treatment to resolve the condition. These two independent doctor visits should be aggregated into one Condition Era."
      },
      {
        "id" : "ConditionEra.condition-era-id",
        "path" : "ConditionEra.condition_era_id",
        "short" : "Condition Era Identifier",
        "definition" : "Condition Era Identifier",
        "min" : 1,
        "max" : "1",
        "type" : [
          {
            "code" : "code"
          }
        ]
      },
      {
        "id" : "ConditionEra.person-id",
        "path" : "ConditionEra.person_id",
        "short" : "Person",
        "definition" : "Person",
        "min" : 1,
        "max" : "1",
        "type" : [
          {
            "code" : "integer"
          }
        ]
      },
      {
        "id" : "ConditionEra.condition-concept-id",
        "path" : "ConditionEra.condition_concept_id",
        "short" : "Condition",
        "definition" : "The Concept Id representing the Condition.",
        "min" : 1,
        "max" : "1",
        "type" : [
          {
            "code" : "code"
          }
        ]
      },
      {
        "id" : "ConditionEra.condition-era-start-date",
        "path" : "ConditionEra.condition_era_start_date",
        "short" : "Condition Era Start Date",
        "definition" : "The start date for the Condition Era constructed from the individual instances of Condition Occurrences. It is the start date of the very firstchronologically recorded instance of the condition with at least 31 days since any prior record of the same Condition.",
        "min" : 1,
        "max" : "1",
        "type" : [
          {
            "code" : "date"
          }
        ]
      },
      {
        "id" : "ConditionEra.condition-era-end-date",
        "path" : "ConditionEra.condition_era_end_date",
        "short" : "Condition Era End Date",
        "definition" : "The end date for the Condition Era constructed from the individual instances of Condition Occurrences. It is the end date of the final continuously recorded instance of the Condition.",
        "min" : 1,
        "max" : "1",
        "type" : [
          {
            "code" : "code"
          }
        ]
      },
      {
        "id" : "ConditionEra.condition-occurrence-count",
        "path" : "ConditionEra.condition_occurrence_count",
        "short" : "Condition Occurence Count",
        "definition" : "The number of individual Condition Occurrences used to construct the\ncondition era.",
        "min" : 0,
        "max" : "1",
        "type" : [
          {
            "code" : "integer"
          }
        ]
      }
    ]
  }
}