<status value="draft"/><experimental value="false"/><date value="2019-11-01T09:29:23+11:00"/><publisher value="HL7 (FHIR Project)"/><contact><telecom><system value="url"/><value value="http://hl7.org/fhir"/></telecom><telecom><system value="email"/><value value="fhir@lists.hl7.org"/></telecom></contact><description value="Identification of the underlying physiological mechanism for a Reaction Risk."/><caseSensitive value="true"/><valueSet value="http://hl7.org/fhir/ValueSet/allergy-intolerance-type"/><content value="complete"/><concept><code value="allergy"/><display value="Allergy"/><definition value="A propensity for hypersensitive reaction(s) to a substance. These reactions are most typically type I hypersensitivity, plus other "allergy-like" reactions, including pseudoallergy."/></concept><concept><code value="intolerance"/><display value="Intolerance"/><definition value="A 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 patient-specific (i.e. are not a reaction that is expected to occur with most or all patients given similar circumstances)."/></concept></CodeSystem>

AllergyIntoleranceType

Identification of the underlying physiological mechanism for a Reaction Risk.

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

Code	Display	Definition
allergy	Allergy	A propensity for hypersensitive reaction(s) to a substance. These reactions are most typically type I hypersensitivity, plus other "allergy-like" reactions, including pseudoallergy.
intolerance	Intolerance	A 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 patient-specific (i.e. are not a reaction that is expected to occur with most or all patients given similar circumstances).