# What subject filter (2.6 - 1.5.0) - HL7 v2.6 Vocabulary v0.2.0

* [**Table of Contents**](toc.md)
* [**Artifacts Summary**](artifacts.md)
* **What subject filter (2.6 - 1.5.0)**

## CodeSystem: What subject filter (2.6 - 1.5.0) (Experimental) 

| | |
| :--- | :--- |
| *Official URL*:http://terminology.hl7.org/v2plusvocab/CodeSystem/whatSubjectFilter | *Version*:1.5.0 |
| Active as of 2026-03-13 | *Computable Name*:WhatSubjectFilter |
| *Other Identifiers:*OID:2.16.840.1.113883.18.20, urn:ietf:rfc:3986#Uniform Resource Identifier (URI)#http://terminology.hl7.org/v2plusvocab/CodeSystem/v2-0048 | |
| **Copyright/Legal**: HL7 Inc., 2026 | |

 
HL7-defined code system of concepts which specify the kind of information that is required to satisfy a query request. The values define the type of transaction inquiry. Used in HL7 Version 2 messaging in the URD segment. 

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

* [Hl7VSwhatSubjectFilter](ValueSet-hl7VSwhatSubjectFilter.md)



## Resource Content

```json
{
  "resourceType" : "CodeSystem",
  "id" : "whatSubjectFilter",
  "extension" : [{
    "url" : "http://terminology.hl7.org/v2plusvocab/StructureDefinition/codesystem-v2versionCreated",
    "valueString" : "2.6"
  },
  {
    "url" : "http://terminology.hl7.org/v2plusvocab/StructureDefinition/codesystem-versionHistory",
    "valueString" : "generate correct history somehow"
  },
  {
    "url" : "http://terminology.hl7.org/v2plusvocab/StructureDefinition/codesystem-tableNo",
    "valueString" : "0048"
  }],
  "url" : "http://terminology.hl7.org/v2plusvocab/CodeSystem/whatSubjectFilter",
  "identifier" : [{
    "system" : "urn:ietf:rfc:3986",
    "value" : "urn:oid:2.16.840.1.113883.18.20"
  },
  {
    "system" : "urn:ietf:rfc:3986",
    "value" : "http://terminology.hl7.org/v2plusvocab/CodeSystem/v2-0048"
  }],
  "version" : "1.5.0",
  "name" : "WhatSubjectFilter",
  "title" : "What subject filter (2.6 - 1.5.0)",
  "status" : "active",
  "experimental" : true,
  "date" : "2026-03-13T11:09:09+00:00",
  "publisher" : "HL7/FO",
  "contact" : [{
    "name" : "HL7/FO",
    "telecom" : [{
      "system" : "url",
      "value" : "http://www.hl7.org"
    }]
  }],
  "description" : "HL7-defined code system of concepts which specify the kind of information that is required to satisfy a query request.  The values define the type of transaction inquiry.  Used in HL7 Version 2 messaging in the URD 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" : "ADV",
    "display" : "Advice/diagnosis",
    "definition" : "Advice/diagnosis",
    "designation" : [{
      "language" : "de",
      "value" : "Ratschlag / Diagnose"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.1"
    }]
  },
  {
    "code" : "ANU",
    "display" : "Nursing unit lookup (returns patients in beds, excluding empty beds)",
    "definition" : "Nursing unit lookup (returns patients in beds, excluding empty beds)",
    "designation" : [{
      "language" : "de",
      "value" : "Stationsinformation (ohne freie Betten)"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.1"
    }]
  },
  {
    "code" : "APA",
    "display" : "Account number query, return matching visit",
    "definition" : "Account number query, return matching visit",
    "designation" : [{
      "language" : "de",
      "value" : "Fälle zu angefragter Rechnungsnummer"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.2"
    }]
  },
  {
    "code" : "APM",
    "display" : "Medical record number query, returns visits for a medical record number",
    "definition" : "Medical record number query, returns visits for a medical record number",
    "designation" : [{
      "language" : "de",
      "value" : "Fälle zu angefragter Krankenaktennummer"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.2"
    }]
  },
  {
    "code" : "APN",
    "display" : "Patient name lookup",
    "definition" : "Patient name lookup",
    "designation" : [{
      "language" : "de",
      "value" : "Patientendaten zu gegebenem Patientennamen"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.1"
    }]
  },
  {
    "code" : "APP",
    "display" : "Physician lookup",
    "definition" : "Physician lookup",
    "designation" : [{
      "language" : "de",
      "value" : "Patienten des spezifizierten Arztes"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.2"
    }]
  },
  {
    "code" : "ARN",
    "display" : "Nursing unit lookup (returns patients in beds, including empty beds)",
    "definition" : "Nursing unit lookup (returns patients in beds, including empty beds)",
    "designation" : [{
      "language" : "de",
      "value" : "Stationsinformation (einschließlich freier Betten)"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.2"
    }]
  },
  {
    "code" : "CAN",
    "display" : "Cancel.  Used to cancel a query",
    "definition" : "Cancel.  Used to cancel a query",
    "designation" : [{
      "language" : "de",
      "value" : "Anfrage stornieren"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.1"
    }]
  },
  {
    "code" : "DEM",
    "display" : "Demographics",
    "definition" : "Demographics",
    "designation" : [{
      "language" : "de",
      "value" : "Demographische Daten"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.1"
    }]
  },
  {
    "code" : "FIN",
    "display" : "Financial",
    "definition" : "Financial",
    "designation" : [{
      "language" : "de",
      "value" : "Finanzdaten"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.2"
    }]
  },
  {
    "code" : "GID",
    "display" : "Generate new identifier",
    "definition" : "Generate new identifier",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.4"
    }]
  },
  {
    "code" : "GOL",
    "display" : "Goals",
    "definition" : "Goals",
    "designation" : [{
      "language" : "de",
      "value" : "Ziele"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "MRI",
    "display" : "Most recent inpatient",
    "definition" : "Most recent inpatient",
    "designation" : [{
      "language" : "de",
      "value" : "Letzter stationärer Patient"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.1"
    }]
  },
  {
    "code" : "MRO",
    "display" : "Most recent outpatient",
    "definition" : "Most recent outpatient",
    "designation" : [{
      "language" : "de",
      "value" : "Letzter ambulanter Patient"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.1"
    }]
  },
  {
    "code" : "NCK",
    "display" : "Network clock",
    "definition" : "Network clock",
    "designation" : [{
      "language" : "de",
      "value" : "Netzwerk-Uhrzeit"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.2"
    }]
  },
  {
    "code" : "NSC",
    "display" : "Network status change",
    "definition" : "Network status change",
    "designation" : [{
      "language" : "de",
      "value" : "Änderung des Netzwerkstatus"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.2"
    }]
  },
  {
    "code" : "NST",
    "display" : "Network statistic",
    "definition" : "Network statistic",
    "designation" : [{
      "language" : "de",
      "value" : "Netzwerkstatistik"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.2"
    }]
  },
  {
    "code" : "ORD",
    "display" : "Order",
    "definition" : "Order",
    "designation" : [{
      "language" : "de",
      "value" : "Auftrag / Verordnung"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.2"
    }]
  },
  {
    "code" : "OTH",
    "display" : "Other",
    "definition" : "Other",
    "designation" : [{
      "language" : "de",
      "value" : "anderes"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.1"
    }]
  },
  {
    "code" : "PRB",
    "display" : "Problems",
    "definition" : "Problems",
    "designation" : [{
      "language" : "de",
      "value" : "Probleme"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "PRO",
    "display" : "Procedure",
    "definition" : "Procedure",
    "designation" : [{
      "language" : "de",
      "value" : "Prozedur"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.1"
    }]
  },
  {
    "code" : "RAR",
    "display" : "Pharmacy administration information",
    "definition" : "Pharmacy administration information",
    "designation" : [{
      "language" : "de",
      "value" : "Erfolgte Verabreichung von Medikamenten"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.2"
    }]
  },
  {
    "code" : "RDR",
    "display" : "Pharmacy dispense information",
    "definition" : "Pharmacy dispense information",
    "designation" : [{
      "language" : "de",
      "value" : "Abgabe von Medikamenten"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.2"
    }]
  },
  {
    "code" : "RER",
    "display" : "Pharmacy encoded order information",
    "definition" : "Pharmacy encoded order information",
    "designation" : [{
      "language" : "de",
      "value" : "Medikamentenverordnung (Apotheke)"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.2"
    }]
  },
  {
    "code" : "RES",
    "display" : "Result",
    "definition" : "Result",
    "designation" : [{
      "language" : "de",
      "value" : "Ergebnis / Befund"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.1"
    }]
  },
  {
    "code" : "RGR",
    "display" : "Pharmacy give information",
    "definition" : "Pharmacy give information",
    "designation" : [{
      "language" : "de",
      "value" : "Verabreichunsgsvorschrift für Medikamente"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.2"
    }]
  },
  {
    "code" : "ROR",
    "display" : "Pharmacy prescription information",
    "definition" : "Pharmacy prescription information",
    "designation" : [{
      "language" : "de",
      "value" : "Medikamentenverordnung"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.2"
    }]
  },
  {
    "code" : "SAL",
    "display" : "All schedule related information, including open slots, booked slots, blocked slots",
    "definition" : "All schedule related information, including open slots, booked slots, blocked slots",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3.1"
    }]
  },
  {
    "code" : "SBK",
    "display" : "Booked slots on the identified schedule",
    "definition" : "Booked slots on the identified schedule",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3.1"
    }]
  },
  {
    "code" : "SBL",
    "display" : "Blocked slots on the identified schedule",
    "definition" : "Blocked slots on the identified schedule",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3.1"
    }]
  },
  {
    "code" : "SOF",
    "display" : "First open slot on the identified schedule after the start date/time",
    "definition" : "First open slot on the identified schedule after the start date/time",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.4"
    }]
  },
  {
    "code" : "SOP",
    "display" : "Open slots on the identified schedule between the begin and end of the start date/time range",
    "definition" : "Open slots on the identified schedule between the begin and end of the start date/time range",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3.1"
    }]
  },
  {
    "code" : "SSA",
    "display" : "Time slots available for a single appointment",
    "definition" : "Time slots available for a single appointment",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3.1"
    }]
  },
  {
    "code" : "SSR",
    "display" : "Time slots available for a recurring appointment",
    "definition" : "Time slots available for a recurring appointment",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3.1"
    }]
  },
  {
    "code" : "STA",
    "display" : "Status",
    "definition" : "Status",
    "designation" : [{
      "language" : "de",
      "value" : "Status"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.1"
    }]
  },
  {
    "code" : "VXI",
    "display" : "Vaccine Information",
    "definition" : "Vaccine Information",
    "designation" : [{
      "language" : "de",
      "value" : "Impfinformation"
    }],
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.3"
    }]
  },
  {
    "code" : "XID",
    "display" : "Get cross-referenced identifiers",
    "definition" : "Get cross-referenced identifiers",
    "property" : [{
      "code" : "versionIntroduced",
      "valueString" : "2.4"
    }]
  }]
}

```
