---
type: "codesystem"
title: "Conditional Read Status"
codesystem: "conditional-read-status"
---
# Conditional Read Status

- **Official URL**: http://hl7.org/fhir/conditional-read-status
- **Version**: 6.0.0
- **Status**: active
- **Name**: ConditionalReadStatus
- **Title**: Conditional Read Status
- **Publisher**: HL7 (FHIR Project)
- **Description**: A code that indicates how the server supports conditional read.
- **Case Sensitive**: true
- **Content**: complete

## Concepts

| Code | Display | Definition |
| --- | --- | --- |
| not-supported | Not Supported | No support for conditional reads. |
| modified-since | If-Modified-Since | Conditional reads are supported, but only with the If-Modified-Since HTTP Header. |
| not-match | If-None-Match | Conditional reads are supported, but only with the If-None-Match HTTP Header. |
| full-support | Full Support | Conditional reads are supported, with both If-Modified-Since and If-None-Match HTTP Headers. |

## CodeSystem XML



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

<CodeSystem xmlns="http://hl7.org/fhir">
  <id value="conditional-read-status"/>
  <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="5"/>
  </extension>
  <url value="http://hl7.org/fhir/conditional-read-status"/>
  <identifier>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.4.201"/>
  </identifier>
  <identifier>
    <use value="old"/>
    <system value="urn:ietf:rfc:3986"/>
    <value value="urn:oid:2.16.840.1.113883.4.642.1.191"/>
  </identifier>
  <version value="6.0.0"/>
  <name value="ConditionalReadStatus"/>
  <title value="Conditional Read Status"/>
  <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 code that indicates how the server supports conditional read."/>
  <caseSensitive value="true"/>
  <valueSet value="http://hl7.org/fhir/ValueSet/conditional-read-status"/>
  <content value="complete"/>
  <concept>
    <code value="not-supported"/>
    <display value="Not Supported"/>
    <definition value="No support for conditional reads."/>
  </concept>
  <concept>
    <code value="modified-since"/>
    <display value="If-Modified-Since"/>
    <definition value="Conditional reads are supported, but only with the If-Modified-Since HTTP Header."/>
  </concept>
  <concept>
    <code value="not-match"/>
    <display value="If-None-Match"/>
    <definition value="Conditional reads are supported, but only with the If-None-Match HTTP Header."/>
  </concept>
  <concept>
    <code value="full-support"/>
    <display value="Full Support"/>
    <definition value="Conditional reads are supported, with both If-Modified-Since and If-None-Match HTTP Headers."/>
  </concept>
</CodeSystem>
```