This is the ValueSet that contains codes in both Allergies & Intolerances - IPS (http://hl7.org/fhir/uv/ips/ValueSet/allergies-intolerances-uv-ips) and Indicator of Hypersensitivity or Intolerance to Substance (https://healthterminologies.gov.au/fhir/ValueSet/indicator-hypersensitivity-intolerance-to-substance-2).