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Definition for Code SystemFilterOperator
{
"resourceType" : "CodeSystem",
"id" : "filter-operator",
"meta" : {
"lastUpdated" : "2025-10-30T03:40:51.999+11:00",
"profile" : ["http://hl7.org/fhir/StructureDefinition/shareablecodesystem"]
},
"text" : {
"status" : "extensions",
"div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\">\n \n \n \n <p>This code system http://hl7.org/fhir/filter-operator defines the following codes:</p>\n \n \n \n <table class=\"codes\">\n \n \n \n <tr>\n \n \n \n <td style=\"white-space:nowrap\">\n \n \n \n <b>Code</b>\n \n \n \n </td>\n \n \n \n <td>\n \n \n \n <b>Display</b>\n \n \n \n </td>\n \n \n \n <td>\n \n \n \n <b>Definition</b>\n \n \n \n </td>\n \n \n \n <td>\n \n \n \n <b>Comments</b>\n \n \n \n </td>\n \n \n \n </tr>\n \n \n \n <tr>\n \n \n \n <td style=\"white-space:nowrap\">=\n \n \n \n <a name=\"filter-operator-.61\"> </a>\n \n \n \n </td>\n \n \n \n <td>Equals</td>\n \n \n \n <td>The specified property of the code equals the provided value.</td>\n \n \n \n <td/>\n \n \n \n </tr>\n \n \n \n <tr>\n \n \n \n <td style=\"white-space:nowrap\">is-a\n \n \n \n <a name=\"filter-operator-is-a\"> </a>\n \n \n \n </td>\n \n \n \n <td>Is A (by subsumption)</td>\n \n \n \n <td>Includes all concept ids that have a transitive is-a relationship with the concept Id provided as the value, including the provided concept itself (include descendant codes and self).</td>\n \n \n \n <td>The definition of is-a is that all the properties of the value are true for the specified property of the code, which means that a code has an is-a relationship with itself. To exclude the root code, use descendent-of</td>\n \n \n \n </tr>\n \n \n \n <tr>\n \n \n \n <td style=\"white-space:nowrap\">descendent-of\n \n \n \n <a name=\"filter-operator-descendent-of\"> </a>\n \n \n \n </td>\n \n \n \n <td>Descendent Of (by subsumption)</td>\n \n \n \n <td>Includes all concept ids that have a transitive is-a relationship with the concept Id provided as the value, excluding the provided concept itself i.e. include descendant codes only).</td>\n \n \n \n <td>The definition of is-a is that all the properties of the value are true for the specified property of the code. \n\nSpelling note: "descendant" is a more correct spelling, but the spelling "descendent" is maintained in the code for backwards compatibility reasons</td>\n \n \n \n </tr>\n \n \n \n <tr>\n \n \n \n <td style=\"white-space:nowrap\">is-not-a\n \n \n \n <a name=\"filter-operator-is-not-a\"> </a>\n \n \n \n </td>\n \n \n \n <td>Not (Is A) (by subsumption)</td>\n \n \n \n <td>The specified property of the code does not have an is-a relationship with the provided value.</td>\n \n \n \n <td/>\n \n \n \n </tr>\n \n \n \n <tr>\n \n \n \n <td style=\"white-space:nowrap\">regex\n \n \n \n <a name=\"filter-operator-regex\"> </a>\n \n \n \n </td>\n \n \n \n <td>Regular Expression</td>\n \n \n \n <td>The specified property of the code matches the regex specified in the provided value.</td>\n \n \n \n <td/>\n \n \n \n </tr>\n \n \n \n <tr>\n \n \n \n <td style=\"white-space:nowrap\">in\n \n \n \n <a name=\"filter-operator-in\"> </a>\n \n \n \n </td>\n \n \n \n <td>In Set</td>\n \n \n \n <td>The specified property of the code is in the set of codes or concepts specified in the provided value (comma-separated list).</td>\n \n \n \n <td/>\n \n \n \n </tr>\n \n \n \n <tr>\n \n \n \n <td style=\"white-space:nowrap\">not-in\n \n \n \n <a name=\"filter-operator-not-in\"> </a>\n \n \n \n </td>\n \n \n \n <td>Not in Set</td>\n \n \n \n <td>The specified property of the code is not in the set of codes or concepts specified in the provided value (comma-separated list).</td>\n \n \n \n <td/>\n \n \n \n </tr>\n \n \n \n <tr>\n \n \n \n <td style=\"white-space:nowrap\">generalizes\n \n \n \n <a name=\"filter-operator-generalizes\"> </a>\n \n \n \n </td>\n \n \n \n <td>Generalizes (by Subsumption)</td>\n \n \n \n <td>Includes all concept ids that have a transitive is-a relationship from the concept Id provided as the value, including the provided concept itself (i.e. include ancestor codes and self).</td>\n \n \n \n <td>The definition of is-a is that all the properties of the value are true for the specified property of the code, which means that a code has an is-a relationship with itself. To exclude the root code, add it explicitly to as an exclude</td>\n \n \n \n </tr>\n \n \n \n <tr>\n \n \n \n <td style=\"white-space:nowrap\">exists\n \n \n \n <a name=\"filter-operator-exists\"> </a>\n \n \n \n </td>\n \n \n \n <td>Exists</td>\n \n \n \n <td>The specified property of the code has at least one value (if the specified value is true; if the specified value is false, then matches when the specified property of the code has no values).</td>\n \n \n \n <td/>\n \n \n \n </tr>\n\t\t\n\t\t\n \n <tr>\n \n \n \n <td style=\"white-space:nowrap\">child-of\n \n \n \n <a name=\"filter-operator-child-of\"> </a>\n \n \n \n </td>\n \n \n \n <td>Child Of</td>\n \n \n \n <td>Only concepts with a direct hierarchical relationship to the index code and no other concepts. This does not include the index code in the output.</td>\n \n \n \n <td/>\n \n \n \n </tr>\n\t\t\n\t\t\n \n <tr>\n \n \n \n <td style=\"white-space:nowrap\">descendent-leaf\n \n \n \n <a name=\"filter-operator-descendent-leaf\"> </a>\n \n \n \n </td>\n \n \n \n <td>Descendent Leaf</td>\n \n \n \n <td>Includes concept ids that have a transitive is-a relationship with the concept Id provided as the value, but which do not have any concept ids with transitive is-a relationships with themselves.</td>\n \n \n \n <td/>\n \n \n \n </tr>\n \n \n \n </table>\n \n \n \n </div>"
},
"extension" : [{
"url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
"valueCode" : "vocab"
},
{
"url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
"valueCode" : "normative"
},
{
"url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-normative-version",
"valueCode" : "4.0.0"
},
{
"url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
"valueInteger" : 5
}],
"url" : "http://hl7.org/fhir/filter-operator",
"identifier" : [{
"system" : "urn:ietf:rfc:3986",
"value" : "urn:oid:2.16.840.1.113883.4.642.4.479"
},
{
"use" : "old",
"system" : "urn:ietf:rfc:3986",
"value" : "urn:oid:2.16.840.1.113883.4.642.1.472"
},
{
"use" : "old",
"system" : "urn:ietf:rfc:3986",
"value" : "urn:oid:2.16.840.1.113883.4.642.2.280"
}],
"version" : "6.0.0-ballot3",
"name" : "FilterOperator",
"title" : "Filter Operator",
"status" : "active",
"experimental" : false,
"date" : "2021-01-05T10:01:24+11:00",
"publisher" : "HL7 (FHIR Project)",
"contact" : [{
"telecom" : [{
"system" : "url",
"value" : "http://hl7.org/fhir"
},
{
"system" : "email",
"value" : "fhir@lists.hl7.org"
}]
}],
"description" : "The kind of operation to perform as a part of a property based filter.",
"jurisdiction" : [{
"coding" : [{
"system" : "http://unstats.un.org/unsd/methods/m49/m49.htm",
"code" : "001",
"display" : "World"
}]
}],
"caseSensitive" : true,
"valueSet" : "http://hl7.org/fhir/ValueSet/filter-operator",
"content" : "complete",
"concept" : [{
"code" : "=",
"display" : "Equals",
"definition" : "The specified property of the code equals the provided value."
},
{
"code" : "is-a",
"display" : "Is A (by subsumption)",
"definition" : "Includes all concept ids that have a transitive is-a relationship with the concept Id provided as the value, including the provided concept itself (include descendant codes and self).",
"property" : [{
"code" : "comments",
"valueString" : "The definition of is-a is that all the properties of the value are true for the specified property of the code, which means that a code has an is-a relationship with itself. To exclude the root code, use descendent-of"
}]
},
{
"code" : "descendent-of",
"display" : "Descendent Of (by subsumption)",
"definition" : "Includes all concept ids that have a transitive is-a relationship with the concept Id provided as the value, excluding the provided concept itself (i.e. include descendant codes only).",
"property" : [{
"code" : "comments",
"valueString" : "The definition of is-a is that all the properties of the value are true for the specified property of the code. \n\nSpelling note: \"descendant\" is a more correct spelling, but the spelling \"descendent\" is maintained in the code for backwards compatibility reasons"
}]
},
{
"code" : "is-not-a",
"display" : "Not (Is A) (by subsumption)",
"definition" : "The specified property of the code does not have an is-a relationship with the provided value."
},
{
"code" : "regex",
"display" : "Regular Expression",
"definition" : "The specified property of the code matches the regex specified in the provided value."
},
{
"code" : "in",
"display" : "In Set",
"definition" : "The specified property of the code is in the set of codes or concepts specified in the provided value (comma-separated list)."
},
{
"code" : "not-in",
"display" : "Not in Set",
"definition" : "The specified property of the code is not in the set of codes or concepts specified in the provided value (comma-separated list)."
},
{
"code" : "generalizes",
"display" : "Generalizes (by Subsumption)",
"definition" : "Includes all concept ids that have a transitive is-a relationship from the concept Id provided as the value, including the provided concept itself (i.e. include ancestor codes and self).",
"property" : [{
"code" : "comments",
"valueString" : "The definition of is-a is that all the properties of the value are true for the specified property of the code, which means that a code has an is-a relationship with itself. To exclude the root code, add it explicitly to as an exclude"
}]
},
{
"code" : "child-of",
"display" : "Child Of",
"definition" : "Only concepts with a direct hierarchical relationship to the index code and no other concepts. This does not include the index code in the output."
},
{
"code" : "descendent-leaf",
"display" : "Descendent Leaf",
"definition" : "Includes concept ids that have a transitive is-a relationship with the concept Id provided as the value, but which do not have any concept ids with transitive is-a relationships with themselves."
},
{
"code" : "exists",
"display" : "Exists",
"definition" : "The specified property of the code has at least one value (if the specified value is true; if the specified value is false, then matches when the specified property of the code has no values)."
}]
}
Usage note: every effort has been made to ensure that the examples are correct and useful, but they are not a normative part of the specification.
FHIR ®© HL7.org 2011+. FHIR R6 hl7.fhir.core#6.0.0-ballot3 generated on Wed, Oct 29, 2025 16:42+0000.
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