This case-sensitive code system http://hl7.org/fhir/allerg-intol-substance-exp-risk defines the following codes:
| Code | Display | Definition |
| known-reaction-risk | Known Reaction Risk | Known risk of allergy or intolerance reaction upon exposure to the specified substance. |
| no-known-reaction-risk | No Known Reaction Risk | No known risk of allergy or intolerance reaction upon exposure to the specified substance. |