description: Defines the essential criteria for an Encounter with an opioid review useful Patient. package_name: hl7.fhir.us.cdc derivation: constraint name: OpioidReviewUsefulPatientEncounter type: Encounter elements: subject: type: Reference refers: ['http://hl7.org/fhir/us/cdc-opioid-cpg/StructureDefinition/OpioidReviewUsefulPatient'] index: 0 package_version: opioid-cpg-1.0.0-ballot class: profile kind: resource url: http://hl7.org/fhir/us/cdc-opioid-cpg/StructureDefinition/OpioidReviewUsefulPatientEncounter base: http://hl7.org/fhir/us/qicore/StructureDefinition/qicore-encounter version: 1.0.0-ballot