Patient Allergy or Intolerance Reaction
A patient's adverse reaction associated with an allergy or intolerance.
Attributes
| Attribute | Type | Multiplicity | Attribute note |
|---|---|---|---|
| Allergy or Intolerance Reaction Manifestation Code | Codeable Concept | 1..*P | Uniquely specifies allergy or intolerance reaction manifestation(s) (e.g., allergic bronchitis).
If not remembered by the patient, a Data Absent Reason (DAR) value (e.g., asked-declined to answer) will be provided in the attribute's Absent Reason Code part (an element of the Codeable Concept Complex Data Type).
Value Sets:
Valid Values
https://fhir.infoway-inforoute.ca/ValueSet/clinicalfindingcode
Data Absent Reasons (in the Absent Reason Code part of the Codeable Concept attribute)
http://terminology.hl7.org/CodeSystem/data-absent-reason |
| Allergy or Intolerance Substance Code | Codeable Concept | 0..1 | Uniquely specifies the particular substance (e.g., Ara h 2) considered to be responsible for the allergic or intolerance reaction.
Value Set: https://fhir.infoway-inforoute.ca/ValueSet/substancecode |
| Patient Allergy or Intolerance Reaction Onset Date Time | Life Date Time | 0..1 | The estimated or actual date and, if available, the time when a reaction began.
Can also be approximate information, as reported (e.g., age, age range, time period, free text description).
|
| Patient Allergy or Intolerance Reaction Last Occurrence Date Time | Date Time | 0..1 | The estimated or actual date and, if known, the of the last known occurrence of this reaction. |
| Patient Allergy or Intolerance Reaction Severity Code | Codeable Concept | 0..1 | Uniquely specifies the provider's assessment of the severity of the reaction (e.g., mild, moderate, severe).
Value Set: https://fhir.infoway-inforoute.ca/ValueSet/allergyintolerancereactionseverity |
| Patient Allergy or Intolerance Reaction Exposure Route Code | Codeable Concept | 0..1 | Uniquely specifies the route by which the person was exposed to the substance (e.g., cutaneous route, oromucosal route, orogastric route).
Value Set: https://fhir.infoway-inforoute.ca/ValueSet/routeofadministration |
Relationships
| From class | From multiplicity | Relationship | To class | To multiplicity |
|---|---|---|---|---|
| Patient Allergy or Intolerance Reaction | 0..* | has | Clinical Information Life Cycle Event | 0..* |
| Patient Allergy or Intolerance | 1 | has (composition) | Patient Allergy or Intolerance Reaction | 0..* |
| Patient Allergy or Intolerance Reaction | 0..* | causes | Patient Allergy or Intolerance | 1 |
| Patient Allergy or Intolerance | 0..* | has (composition) | Patient Allergy or Intolerance Reaction | 0..* |
| Patient Allergy or Intolerance Reaction | 0..1 | has (composition) | Clinical Annotation | 0..* |
Contact us
If you have questions about this initiative, would like to be added to our stakeholder notification list or would like to participate in our consultations, please email us.
How to cite:
Canadian Institute for Health Information. Patient Allergy or Intolerance Reaction. Accessed November 02, 2026.
