{description: Accesses the DrugPlan ID of a FormularyDrug, package_name: hl7.fhir.us.davinci, name: DrugPlan, type: token, package_version: drug-formulary-1.0.0, class: unknown, kind: null, url: 'http://hl7.org/fhir/us/Davinci-drug-formulary/SearchParameter/DrugPlan', version: 1.0.0}