description: 'This observation represents a simple observation indicating whether a person has any advance directive documents. When documents are available, a system can nest the needed references to the advance directive documents inside this Advance Directive Existence Observation.\n\n#### Templates Used\nAlthough open templates may contain any valid CDA content, the following templates are specifically called out by this template:\n\n**Optional EntryRelationships**: [AdvanceDirectiveObservation](StructureDefinition-AdvanceDirectiveObservation.html)'
package_name: hl7.cda.us.ccda
derivation: constraint
name: AdvanceDirectiveExistenceObservation
type: http://hl7.org/cda/stds/core/StructureDefinition/Observation
elements:
  entryRelationship:
    index: 20
    elements:
      typeCode:
        pattern: {type: code, value: REFR}
        type: code
        index: 21
      observation: {type: 'http://hl7.org/cda/stds/core/StructureDefinition/Observation', index: 22}
    required: [observation]
  value:
    type: http://hl7.org/cda/stds/core/StructureDefinition/CD
    binding: {strength: required, valueSet: 'http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113762.1.4.1267.16'}
    index: 17
  classCode:
    pattern: {type: code, value: OBS}
    type: code
    index: 4
  author: {type: 'http://hl7.org/cda/stds/core/StructureDefinition/Author', index: 18}
  id: {index: 6}
  code:
    short: Advance directive/living will completed
    index: 8
    elements:
      code:
        pattern: {type: code, value: 45473-6}
        type: code
        index: 9
      codeSystem:
        short: LOINC
        pattern: {type: string, value: 2.16.840.1.113883.6.1}
        type: string
        index: 10
    required: [code, codeSystem]
  moodCode:
    pattern: {type: code, value: EVN}
    type: code
    index: 5
  effectiveTime:
    short: 'Note: This template represents a "snapshot in time" observation. As a result, the effectiveTime is constrained to just a time stamp.'
    constraint:
      value-only: {human: Interval fields SHALL NOT be present, source: 'http://hl7.org/cda/us/ccda/StructureDefinition/AdvanceDirectiveExistenceObservation', severity: error, expression: (low | high | width | center).empty()}
    index: 15
    elements:
      value: {short: value should be used instead of low/high, index: 16}
  templateId:
    index: 0
    slicing:
      rules: open
      discriminator:
      - {path: root, type: value}
      - {path: extension, type: value}
      min: 1
      slices:
        advance-directive-exist-obs:
          match: {root: 2.16.840.1.113883.10.20.22.4.513, extension: '2025-05-01'}
          schema:
            _required: true
            index: 1
            elements:
              root:
                pattern: {type: string, value: 2.16.840.1.113883.10.20.22.4.513}
                type: string
                index: 2
              extension:
                pattern: {type: string, value: '2025-05-01'}
                type: string
                index: 3
            required: [extension, root]
            extensions: {}
  sdtcCategory:
    binding: {strength: preferred, valueSet: 'http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.11.20.9.69.4'}
    index: 7
  statusCode:
    index: 13
    elements:
      code:
        pattern: {type: code, value: completed}
        type: code
        index: 14
    required: [code]
  informant: {short: 'MAY contain zero or one [0..1] informant', index: 19}
  text:
    short: SHOULD reference the portion of section narrative text corresponding to this entry
    index: 11
    elements:
      reference:
        constraint:
          value-starts-octothorpe: {human: 'If reference/@value is present, it SHALL begin with a ''#'' and SHALL point to its corresponding narrative', source: 'http://hl7.org/cda/us/ccda/StructureDefinition/AdvanceDirectiveExistenceObservation', severity: error, expression: value.exists() implies value.startsWith('#')}
        index: 12
package_version: 4.0.0
class: logical
kind: logical
url: http://hl7.org/cda/us/ccda/StructureDefinition/AdvanceDirectiveExistenceObservation
base: http://hl7.org/cda/stds/core/StructureDefinition/Observation
version: 4.0.0
required: [author, effectiveTime, id, statusCode, templateId, text, value]