Patient Allergy or Intolerance
A patient’s allergy (immunological hypersensitivity) or intolerance (non-immunological adverse reaction) to a substance.
Appears in
Constraints
Unique key(s)
- Patient, Allergy or Intolerance Code, Allergy or Intolerance Type Code, Patient Allergy or Intolerance Onset Date Time.Value if specified
Stereotype(s)
n/a
Attributes
| Attribute | Type | Multiplicity | Attribute note |
|---|---|---|---|
| Allergy or Intolerance Code | Codeable Concept | 1 | Uniquely specifies the pharmaceutical or biological product or substance (e.g., peanut) to which the person has an allergy or intolerance.
Value Set: https://fhir.infoway-inforoute.ca/ValueSet/pharmaceuticalbiologicproductandsubstancecode |
| Allergy or Intolerance Type Code | Codeable Concept | 1 | Uniquely specifies the underlying physiological mechanism for the reaction risk, i.e., allergy or intolerance.
Value Set: https://fhir.infoway-inforoute.ca/ValueSet/allergyintolerancetype |
| Patient Allergy or Intolerance Date Time | Date Time | 1 | 0 |
| Allergy or Intolerance Category Code | Codeable Concept | 0..1 | Uniquely specifies the classification of the pharmaceutical, biological product or substance (e.g., food, medication, environment) to which the person has the allergy or intolerance.
Value Set: https://fhir.infoway-inforoute.ca/ValueSet/allergyintolerancecategory |
| Patient Allergy or Intolerance Onset Date Time | Life Date Time | 0..1 | The estimated or actual date and, if known, the time when the allergy or intolerance was identified or reported to have begun.
Can also be approximate information, as reported (e.g., age, age range, time period, free text description). |
| Patient Allergy or Intolerance Clinical Status Code | Codeable Concept | 0..1 | Uniquely specifies the clinical status of the allergy or intolerance (e.g., active, inactive, resolved).
Value Set: https://fhir.infoway-inforoute.ca/ValueSet/allergyintoleranceclinicalstatuscodes |
| Patient Allergy or Intolerance Verification Status Code | Codeable Concept | 0..1 | Uniquely specifies the confirmation status of the risk of reaction to the identified product or substance (e.g., confirmed, refuted, presumed).
Value Set: https://fhir.infoway-inforoute.ca/ValueSet/allergyintoleranceverificationstatus |
| Patient Allergy or Intolerance Reaction Risk Code | Codeable Concept | 0..1 | Uniquely specifies an estimate of the potential clinical harm, or seriousness, of the reaction to the identified substance (e.g., low risk, high risk, unable to assess risk).
Value Set: https://fhir.infoway-inforoute.ca/ValueSet/allergyintolerancecriticality |
| Patient Allergy or Intolerance Resolution Date Time | Date Time | 0..1 | The estimated or actual date and, if known, the time when the allergy or intolerance was resolved or went into remission. |
| Patient Allergy or Intolerance Last Reaction Occurrence Date Time | Life Date Time | 0..1 | The estimated or actual date and, if available, time of the last known reaction occurrence. |
Relationships
| From class | From multiplicity | Relationship | To class | To multiplicity |
|---|---|---|---|---|
| Patient Allergy or Intolerance | 0..* | documented in | Encounter | 0..1 |
| Patient Allergy or Intolerance | 0..* | has | Clinical Information Life Cycle Event | 0..* |
| Patient Allergy or Intolerance | 0..* | for | Patient | 1 |
| Patient Allergy or Intolerance | 0..1 | has (composition) | Clinical Annotation | 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..* |
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. Accessed November 02, 2026.
