# Match Reason (2.8.1 - 1.0.0) - HL7 v2.8.1 Vocabulary v0.2.0

* [**Table of Contents**](toc.md)
* [**Artifacts Summary**](artifacts.md)
* **Match Reason (2.8.1 - 1.0.0)**

## CodeSystem: Match Reason (2.8.1 - 1.0.0) (Experimental) 

| | |
| :--- | :--- |
| *Official URL*:http://terminology.hl7.org/v2plusvocab/CodeSystem/matchReason | *Version*:1.0.0 |
| Active as of 2026-03-13 | *Computable Name*:MatchReason |
| *Other Identifiers:*OID:2.16.840.1.113883.18.243, urn:ietf:rfc:3986#Uniform Resource Identifier (URI)#http://terminology.hl7.org/v2plusvocab/CodeSystem/v2-0392 | |
| **Copyright/Legal**: HL7 Inc., 2026 | |

 
Code system of concepts identifying what search components (e.g., name, birthdate, social security number) of the record returned matched the original query where the responding system does not assign numeric match weights or confidence levels. It provides a method for passing a descriptive indication of the reason a particular record was found. Used in HL7 Version 2.x messaging in the Query Response Instance (QRI) segment. 

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

* [Hl7VSmatchReason](ValueSet-hl7VSmatchReason.md)



## Resource Content

```json
{
  "resourceType" : "CodeSystem",
  "id" : "matchReason",
  "extension" : [{
    "url" : "http://terminology.hl7.org/v2plusvocab/StructureDefinition/codesystem-v2versionCreated",
    "valueString" : "2.8.1"
  },
  {
    "url" : "http://terminology.hl7.org/v2plusvocab/StructureDefinition/codesystem-versionHistory",
    "valueString" : "generate correct history somehow"
  },
  {
    "url" : "http://terminology.hl7.org/v2plusvocab/StructureDefinition/codesystem-tableNo",
    "valueString" : "0392"
  }],
  "url" : "http://terminology.hl7.org/v2plusvocab/CodeSystem/matchReason",
  "identifier" : [{
    "system" : "urn:ietf:rfc:3986",
    "value" : "urn:oid:2.16.840.1.113883.18.243"
  },
  {
    "system" : "urn:ietf:rfc:3986",
    "value" : "http://terminology.hl7.org/v2plusvocab/CodeSystem/v2-0392"
  }],
  "version" : "1.0.0",
  "name" : "MatchReason",
  "title" : "Match Reason (2.8.1 - 1.0.0)",
  "status" : "active",
  "experimental" : true,
  "date" : "2026-03-13T11:11:38+00:00",
  "publisher" : "HL7/FO",
  "contact" : [{
    "name" : "HL7/FO",
    "telecom" : [{
      "system" : "url",
      "value" : "http://www.hl7.org"
    }]
  }],
  "description" : "Code system of concepts identifying what search components (e.g., name, birthdate, social security number) of the record returned matched the original query where the responding system does not assign numeric match weights or confidence levels.  It provides a method for passing a descriptive indication of the reason a particular record was found.  Used in HL7 Version 2.x messaging in the Query Response Instance (QRI) segment.",
  "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" : "DB",
    "display" : "Match on Date of Birth",
    "definition" : "Match on Date of Birth",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.4"
    }]
  },
  {
    "code" : "NA",
    "display" : "Match on Name (Alpha Match)",
    "definition" : "Match on Name (Alpha Match)",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.4"
    }]
  },
  {
    "code" : "NP",
    "display" : "Match on Name (Phonetic Match)",
    "definition" : "Match on Name (Phonetic Match)",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.4"
    }]
  },
  {
    "code" : "SS",
    "display" : "Match on Social Security Number",
    "definition" : "Match on Social Security Number",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.4"
    }]
  }]
}

```
