Name Flags Card. Type Description & Constraints doco
. . Extension C 1..* Extension Exposure risk of adverse reaction (allergy or intolerance) to the specified substance/product
inv-1: If the substanceExposureRisk extension element is present, the AllergyIntolerance.code element must be omitted OR ELSE.
inv-3: Something
. . . extension:substance 1..* Extension Substance (or pharmaceutical product)
. . . . extension 0 .. 0
. . . . url 1 .. 1 uri "substance"
. . . . value[x] 1.. 1 CodeableConcept Value of extension
Binding: http://hl7.org/fhir/ValueSet/substance-code2 ( required ): Codes defining the type of the substance (including pharmaceutical products). (2)

. . . extension:exposureRisk1 1..1 Extension known-reaction-risk | no-known-reaction-risk
. . . . extension 0 .. 0
. . . . url 1 .. 1 uri "exposureRisk"
. . . . value[x] 1.. 1 CodeableConcept Value of extension
Binding: AllergyIntolerance substance exposure risk ( required ): The risk of an adverse reaction (allergy or intolerance) for this patient upon exposure to the substance (including pharmaceutical products).

. . . url 1 .. 1 uri "http://hl7.org/fhir/StructureDefinition/allergyintolerance-substanceExposureRisk1"
. . . value[x] 0 .. 0

doco Documentation for this format