description: This cross-version extension represents ExplanationOfBenefit.referral from http://hl7.org/fhir/StructureDefinition/ExplanationOfBenefit|3.0.2 for use in FHIR R4. package_name: hl7.fhir.uv.xver-r3.r4 derivation: constraint name: ext_R3_ExplanationOfBenefit_referral type: Extension elements: value: base: {path: 'Extension.value[x]'} short: Treatment Referral choices: [valueReference] index: 1 valueReference: short: Treatment Referral refers: ['http://hl7.org/fhir/StructureDefinition/ReferralRequest'] type: Reference base: {path: 'Extension.value[x]'} choiceOf: value index: 2 url: pattern: {type: uri, value: 'http://hl7.org/fhir/3.0/StructureDefinition/extension-ExplanationOfBenefit.referral'} type: uri index: 3 package_version: 0.0.1-snapshot-1 class: extension kind: complex-type url: http://hl7.org/fhir/3.0/StructureDefinition/extension-ExplanationOfBenefit.referral base: http://hl7.org/fhir/StructureDefinition/Extension version: 0.0.1-snapshot-1 required: [url]