This code system http://hl7.org/fhir/allergy-intolerance-type defines the following codes:

CodeDisplayDefinition
allergyAllergyA propensity for hypersensitivity reaction(s) to a substance. These reactions are most typically type I hypersensitivity, plus other "allergy-like" reactions, including pseudoallergy.
intoleranceIntoleranceA propensity for adverse reactions to a substance that is not judged to be allergic or "allergy-like". These reactions are typically (but not necessarily) non-immune. They are to some degree idiosyncratic and/or individually specific (i.e. are not a reaction that is expected to occur with most or all patients given similar circumstances).

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