{
  "resourceType": "ValueSet",
  "status": "draft",
  "name": "AllDataAbsentReasonVS",
  "id": "all-data-absent-reason",
  "title": "Data absent reason -- all codes",
  "description": "Data absent reason -- FHIR's own vocabulary for why a value is missing: `unknown`,\n`asked-declined`, `not-applicable`, `masked`, `temp-unknown`.\n\nThis specification reaches for it in the sociodemographic value sets alongside the HL7 v3 NullFlavor\ncodes, so that a decline or an unknown is recorded as an absence rather than as a made-up value.\nThe two vocabularies overlap; both are accepted, and a consumer reading these elements has to handle\neither.\n\nPublished by **HL7 International** as part of HL7 Terminology (THO). Browse it at\n<https://terminology.hl7.org/CodeSystem-data-absent-reason.html>. THO is made available under the\nCC0 designation; see <https://terminology.hl7.org/license.html>.\n\nThe canonical URI is `http://terminology.hl7.org/CodeSystem/data-absent-reason`.\n\n**The set enumerates no codes of its own.** It includes the whole system, so it means every code in it, and it exists so the system URI resolves to a definition rather than to nothing. The definition itself stays with the publisher at the canonical above: this specification does not redefine the system and does not restrict it. Where this page shows a list of codes, that list is a SAMPLE reproduced under the publisher's own terms and is not the set's content -- the page says how many of how many it is showing.",
  "url": "https://fhir.apps.health/ValueSet/all-data-absent-reason",
  "experimental": false,
  "date": "2026-08-22",
  "publisher": "WELLSTAR Technologies Corp.",
  "copyright": "This material derives from HL7 Terminology (THO). THO is copyright (c) 1989+ Health Level Seven International and is made available under the CC0 designation (https://terminology.hl7.org/license.html). This value set enumerates no codes.",
  "compose": {
    "include": [
      {
        "system": "http://terminology.hl7.org/CodeSystem/data-absent-reason"
      }
    ]
  }
}