---
type: "codesystem"
title: "Search Modifier Code"
codesystem: "search-modifier-code"
---
# Search Modifier Code

- **Official URL**: http://hl7.org/fhir/search-modifier-code
- **Version**: 6.0.0
- **Status**: active
- **Name**: SearchModifierCode
- **Title**: Search Modifier Code
- **Publisher**: HL7 (FHIR Project)
- **Description**: A supported modifier for a search parameter.
- **Case Sensitive**: true
- **Content**: complete

## Concepts

| Code | Display | Definition |
| --- | --- | --- |
| missing | Missing | The search parameter returns resources that have a value or not. |
| exact | Exact | The search parameter returns resources that have a value that exactly matches the supplied parameter (the whole string, including casing and accents). |
| contains | Contains | The search parameter returns resources that include the supplied parameter value anywhere within the field being searched. |
| not | Not | The search parameter returns resources that do not contain a match. |
| text | Text | The search parameter is processed as a string that searches text associated with the code/value - either CodeableConcept.text, Coding.display, Identifier.type.text, or Reference.display. |
| in | In | The search parameter is a URI (relative or absolute) that identifies a value set, and the search parameter tests whether the coding is in the specified value set. |
| not-in | Not In | The search parameter is a URI (relative or absolute) that identifies a value set, and the search parameter tests whether the coding is not in the specified value set. |
| below | Below | The search parameter tests whether the value in a resource is subsumed by the specified value (is-a, or hierarchical relationships). |
| above | Above | The search parameter tests whether the value in a resource subsumes the specified value (is-a, or hierarchical relationships). |
| type | Type | The search parameter only applies to the Resource Type specified as a modifier (e.g. the modifier is not actually :type, but :Patient etc.). |
| identifier | Identifier | The search parameter applies to the identifier on the resource, not the reference. |
| of-type | Of Type | The search parameter has the format system|code|value, where the system and code refer to an Identifier.type.coding.system and .code, and match if any of the type codes match. All 3 parts must be present. |
| code-text | Code Text | Tests whether the textual display value in a resource (e.g., CodeableConcept.text, Coding.display, or Reference.display) matches the supplied parameter value. |
| text-advanced | Text Advanced | Tests whether the value in a resource matches the supplied parameter value using advanced text handling that searches text associated with the code/value - e.g., CodeableConcept.text, Coding.display, or Identifier.type.text. |
| iterate | Iterate | The search parameter indicates an inclusion directive (_include, _revinclude) that is applied to an included resource instead of the matching resource. |

## CodeSystem XML



```xml
<?xml version="1.0" encoding="UTF-8"?>

<CodeSystem xmlns="http://hl7.org/fhir">
  <id value="search-modifier-code"/>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="fhir"/>
  </extension>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status">
    <valueCode value="normative"/>
  </extension>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm">
    <valueInteger value="3"/>
  </extension>
  <url value="http://hl7.org/fhir/search-modifier-code"/>
  <identifier>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.4.640"/>
  </identifier>
  <identifier>
    <use value="old"/>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.1.625"/>
  </identifier>
  <identifier>
    <use value="old"/>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.2.92"/>
  </identifier>
  <version value="6.0.0"/>
  <name value="SearchModifierCode"/>
  <title value="Search Modifier Code"/>
  <status value="active"/>
  <experimental value="false"/>
  <date value="2021-01-05T10:01:24+11:00"/>
  <publisher value="HL7 (FHIR Project)"/>
  <contact>
    <telecom>
      <system value="url"/>
      <value value="http://hl7.org/fhir"/>
    </telecom>
    <telecom>
      <system value="email"/>
      <value value="fhir@lists.hl7.org"/>
    </telecom>
  </contact>
  <description value="A supported modifier for a search parameter."/>
  <caseSensitive value="true"/>
  <valueSet value="http://hl7.org/fhir/ValueSet/search-modifier-code"/>
  <content value="complete"/>
  <concept>
    <code value="missing"/>
    <display value="Missing"/>
    <definition value="The search parameter returns resources that have a value or not."/>
  </concept>
  <concept>
    <code value="exact"/>
    <display value="Exact"/>
    <definition value="The search parameter returns resources that have a value that exactly matches the supplied parameter (the whole string, including casing and accents)."/>
  </concept>
  <concept>
    <code value="contains"/>
    <display value="Contains"/>
    <definition value="The search parameter returns resources that include the supplied parameter value anywhere within the field being searched."/>
  </concept>
  <concept>
    <code value="not"/>
    <display value="Not"/>
    <definition value="The search parameter returns resources that do not contain a match."/>
  </concept>
  <concept>
    <code value="text"/>
    <display value="Text"/>
    <definition value="The search parameter is processed as a string that searches text associated with the code/value - either CodeableConcept.text, Coding.display, Identifier.type.text, or Reference.display."/>
  </concept>
  <concept>
    <code value="in"/>
    <display value="In"/>
    <definition value="The search parameter is a URI (relative or absolute) that identifies a value set, and the search parameter tests whether the coding is in the specified value set."/>
  </concept>
  <concept>
    <code value="not-in"/>
    <display value="Not In"/>
    <definition value="The search parameter is a URI (relative or absolute) that identifies a value set, and the search parameter tests whether the coding is not in the specified value set."/>
  </concept>
  <concept>
    <code value="below"/>
    <display value="Below"/>
    <definition value="The search parameter tests whether the value in a resource is subsumed by the specified value (is-a, or hierarchical relationships)."/>
  </concept>
  <concept>
    <code value="above"/>
    <display value="Above"/>
    <definition value="The search parameter tests whether the value in a resource subsumes the specified value (is-a, or hierarchical relationships)."/>
  </concept>
  <concept>
    <code value="type"/>
    <display value="Type"/>
    <definition value="The search parameter only applies to the Resource Type specified as a modifier (e.g. the modifier is not actually :type, but :Patient etc.)."/>
  </concept>
  <concept>
    <code value="identifier"/>
    <display value="Identifier"/>
    <definition value="The search parameter applies to the identifier on the resource, not the reference."/>
  </concept>
  <concept>
    <code value="of-type"/>
    <display value="Of Type"/>
    <definition value="The search parameter has the format system|code|value, where the system and code refer to an Identifier.type.coding.system and .code, and match if any of the type codes match. All 3 parts must be present."/>
  </concept>
  <concept>
    <code value="code-text"/>
    <display value="Code Text"/>
    <definition value="Tests whether the textual display value in a resource (e.g., CodeableConcept.text, Coding.display, or Reference.display) matches the supplied parameter value."/>
  </concept>
  <concept>
    <code value="text-advanced"/>
    <display value="Text Advanced"/>
    <definition value="Tests whether the value in a resource matches the supplied parameter value using advanced text handling that searches text associated with the code/value - e.g., CodeableConcept.text, Coding.display, or Identifier.type.text."/>
  </concept>
  <concept>
    <code value="iterate"/>
    <display value="Iterate"/>
    <definition value="The search parameter indicates an inclusion directive (_include, _revinclude) that is applied to an included resource instead of the matching resource."/>
  </concept>
</CodeSystem>
```