# Segment Action Code (2.5.1 - 1.0.0) - HL7 v2.5.1 Vocabulary v0.1.0

* [**Table of Contents**](toc.md)
* [**Artifacts Summary**](artifacts.md)
* **Segment Action Code (2.5.1 - 1.0.0)**

## CodeSystem: Segment Action Code (2.5.1 - 1.0.0) (Experimental) 

| | |
| :--- | :--- |
| *Official URL*:http://terminology.hl7.org/v2plusvocab/CodeSystem/segmentAction | *Version*:1.0.0 |
| Active as of 2026-01-27 | *Computable Name*:SegmentAction |
| *Other Identifiers:*OID:2.16.840.1.113883.18.111 | |
| **Copyright/Legal**: HL7 Inc., 2026 | |

 
HL7-defined code system of concepts specifying actions to be applied for segments when an HL7 version 2 interface is operating in "action code mode" (a kind of update mode in the Standard). Used in HL7 Version 2.x messaging in the RXA, RXV, LCH, IAM, ARV, IN1 and OH1 segments. 

 This Code system is referenced in the content logical definition of the following value sets: 

* [Hl7VSsegmentActionCode](ValueSet-hl7VSsegmentActionCode.md)



## Resource Content

```json
{
  "resourceType" : "CodeSystem",
  "id" : "segmentAction",
  "extension" : [
    {
      "url" : "http://terminology.hl7.org/v2plusvocab/StructureDefinition/codesystem-v2versionCreated",
      "valueString" : "2.5.1"
    },
    {
      "url" : "http://terminology.hl7.org/v2plusvocab/StructureDefinition/codesystem-versionHistory",
      "valueString" : "generate correct history somehow"
    },
    {
      "url" : "http://terminology.hl7.org/v2plusvocab/StructureDefinition/codesystem-tableNo",
      "valueString" : "0206"
    }
  ],
  "url" : "http://terminology.hl7.org/v2plusvocab/CodeSystem/segmentAction",
  "identifier" : [
    {
      "system" : "urn:ietf:rfc:3986",
      "value" : "urn:oid:2.16.840.1.113883.18.111"
    }
  ],
  "version" : "1.0.0",
  "name" : "SegmentAction",
  "title" : "Segment Action Code (2.5.1 - 1.0.0)",
  "status" : "active",
  "experimental" : true,
  "date" : "2026-01-27T19:29:18+00:00",
  "publisher" : "HL7/FO",
  "contact" : [
    {
      "name" : "HL7/FO",
      "telecom" : [
        {
          "system" : "url",
          "value" : "http://www.hl7.org"
        }
      ]
    }
  ],
  "description" : "HL7-defined code system of concepts specifying actions to be applied for segments when an HL7 version 2 interface is operating in \"action code mode\" (a kind of update mode in the Standard).  Used in HL7 Version 2.x messaging in the RXA, RXV, LCH, IAM, ARV, IN1 and OH1 segments.",
  "copyright" : "HL7 Inc., 2026",
  "caseSensitive" : true,
  "compositional" : false,
  "content" : "complete",
  "property" : [
    {
      "code" : "versionIntroduced",
      "uri" : "http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#versionIntroduced",
      "description" : "version when was this code introduced",
      "type" : "string"
    },
    {
      "code" : "versionDeprecated",
      "uri" : "http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#versionDeprecated",
      "description" : "version when was this code deprecated",
      "type" : "string"
    },
    {
      "code" : "status",
      "uri" : "http://hl7.org/fhir/concept-properties#status",
      "description" : "A code that indicates the status of the concept. Typical values are active, experimental, deprecated, and retired",
      "type" : "code"
    },
    {
      "code" : "comment",
      "uri" : "http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#comment",
      "description" : "A string that provides additional detail pertinent to the use or understanding of the concept",
      "type" : "string"
    },
    {
      "code" : "usage",
      "uri" : "http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#usage",
      "description" : "usage notes for this code",
      "type" : "string"
    },
    {
      "code" : "modified",
      "uri" : "http://terminology.hl7.org/v2plusvocab/CodeSystem/Property#modified",
      "description" : "date of last modification",
      "type" : "dateTime"
    }
  ],
  "concept" : [
    {
      "code" : "A",
      "display" : "Add/Insert",
      "definition" : "Add/Insert",
      "designation" : [
        {
          "language" : "de",
          "value" : "Einfügen"
        }
      ],
      "property" : [
        {
          "code" : "versionIntroduced",
          "valueString" : "2.3"
        }
      ]
    },
    {
      "code" : "D",
      "display" : "Delete",
      "definition" : "Delete",
      "designation" : [
        {
          "language" : "de",
          "value" : "Löschen/Stornieren"
        }
      ],
      "property" : [
        {
          "code" : "versionIntroduced",
          "valueString" : "2.3"
        }
      ]
    },
    {
      "code" : "U",
      "display" : "Update",
      "definition" : "Update",
      "designation" : [
        {
          "language" : "de",
          "value" : "Ändern"
        }
      ],
      "property" : [
        {
          "code" : "versionIntroduced",
          "valueString" : "2.3"
        }
      ]
    }
  ]
}

```
