EHDS Logical Information Models
0.2.1 - qa-preview

EHDS Logical Information Models, published by Xt-EHR. This guide is not an authorized publication; it is the continuous build for version 0.2.1 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/Xt-EHR/xt-ehr-common/ and changes regularly. See the Directory of published versions

## Logical Model: EHDSAllergyIntolerance - Detailed Descriptions

Draft as of 2026-02-05

Definitions for the EHDSAllergyIntolerance logical model.

- Key Elements Table
- Differential Elements Table
- Snapshot Elements Table

Guidance on how to interpret the contents of this table can be foundhere

0. EHDSAllergyIntolerance
Definition | EHDS refined base model for allergy/intolerance Base definition for all types defined in FHIR type system.
Short | Allergy intolerance modelBase for all types and resources
Control | 0..*
Is Modifier | false
Logical Model | Instances of this logical model are not marked to be the target of a Reference
2. EHDSAllergyIntolerance.header
Definition | Basic metadata for this information
Short | Basic metadata for this information
Control | 1..1
Type | Base
4. EHDSAllergyIntolerance.header.subject
Definition | Patient/subject information
Short | Patient/subject information
Control | 1..1
Type | http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSPatient
6. EHDSAllergyIntolerance.header.identifier
Definition | Business identifier for the object, unique within its system. Supporting disambiguation between different contexts (systems/countries).
Short | Business identifier for the object, unique within its system. Supporting disambiguation between different contexts (systems/countries).
Note | This is a business identifier, not a resource identifier (see discussion)
Control | 0..*
Type | Identifier
8. EHDSAllergyIntolerance.header.author[x]
Definition | The author of the allergy/intolerance information.
Short | The author of the allergy/intolerance information.
Control | 0..*
Type | Choice of: http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSHealthProfessional, http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSOrganisation, http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSDevice
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
10. EHDSAllergyIntolerance.header.date
Definition | Date and optionally time of authoring/issuing
Short | Date and optionally time of authoring/issuing
Control | 0..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
12. EHDSAllergyIntolerance.header.status
Definition | Current status of the allergy or intolerance, for example, whether it is active, in remission, resolved, etc.
Short | Current status of the allergy or intolerance, for example, whether it is active, in remission, resolved, etc.
Control | 1..1
Binding | HL7 allergy intolerance status
Type | CodeableConcept
Requirements | eHN PS Guideline, MyHealth@EU, ISO IPS
14. EHDSAllergyIntolerance.header.source
Definition | Source of information (e.g. patient, patient's proxy). Used in case the patient has authored the information or the author has submitted patient-stated information.
Short | Source of information (e.g. patient, patient's proxy). Used in case the patient has authored the information or the author has submitted patient-stated information.
Control | 0..1
Type | CodeableConcept
16. EHDSAllergyIntolerance.header.language
Definition | Language in which the resource is written. Language is expressed by the IETF language tag.
Short | Language in which the resource is written. Language is expressed by the IETF language tag.
Control | 0..1
Binding | BCP 47
Type | CodeableConcept
18. EHDSAllergyIntolerance.agentOrAllergen
Definition | Code for an allergy or intolerance statement (either a positive or a negated/excluded statement). This may be a code for a substance or pharmaceutical product that is considered to be responsible for the adverse reaction risk (e.g., "Latex"), an allergy or intolerance condition (e.g., "Latex allergy"), or a negated/excluded code for a specific substance or class (e.g., "No latex allergy") It must be clinically safe to only process the 'code' and ignore the 'reaction.substance'.
Short | Code that identifies the allergy or intolerance
Control | 1..1
Binding | ATC, EMA SPOR SMS, SNOMED CT
Type | CodeableConcept
Requirements | eHN PS Guideline, MyHealth@EU, ISO IPS
20. EHDSAllergyIntolerance.note
Definition | Additional information about the allergy or intolerance
Short | Additional information about the allergy or intolerance
Control | 0..1
Type | string
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Requirements | eHN PS Guideline, ISO IPS
22. EHDSAllergyIntolerance.criticality
Definition | Estimate of the potential clinical harm, or seriousness, of a reaction to an identified substance.
Short | Estimate of the potential clinical harm, or seriousness, of a reaction to an identified substance.
Control | 0..1
Binding | HL7 allergy intolerance criticality
Type | CodeableConcept
Requirements | eHN PS Guideline, MyHealth@EU, ISO IPS
24. EHDSAllergyIntolerance.certainty
Definition | Assertion about the certainty associated with a propensity, or potential risk, of a reaction to the identified substance. Diagnostic and /or clinical evidence of condition
Short | Assertion about the certainty associated with a propensity, or potential risk, of a reaction to the identified substance. Diagnostic and /or clinical evidence of condition
Control | 0..1
Binding | HL7 allergy intolerance verification
Type | CodeableConcept
Requirements | eHN PS Guideline, MyHealth@EU, ISO IPS
26. EHDSAllergyIntolerance.onsetDate
Definition | When allergy or intolerance was identified
Short | When allergy or intolerance was identified
Control | 0..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Requirements | MyHealth@EU, ISO IPS
28. EHDSAllergyIntolerance.endDate
Definition | Date of resolution of the allergy (e.g. when the clinician deemed there is no longer any need to track the underlying condition)
Short | Date of resolution of the allergy (e.g. when the clinician deemed there is no longer any need to track the underlying condition)
Control | 0..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Requirements | eHN PS Guideline, MyHealth@EU, ISO IPS
30. EHDSAllergyIntolerance.reaction
Definition | Adverse reaction events linked to exposure to substance.
Short | Adverse reaction events linked to exposure to substance.
Control | 0..*
Type | Base
Requirements | ISO IPS (explicit), implicitly in eHN PS Guideline, MH@EU
32. EHDSAllergyIntolerance.reaction.agentOrAllergen
Definition | Identification of the specific substance (or pharmaceutical product) considered to be responsible for the Adverse Reaction event. Note: the substance for a specific reaction may be different from the substance identified as the cause of the risk, but it must be consistent with it. It must be clinically safe to only process the 'code' and ignore the 'reaction.substance'.
Short | Specific substance or pharmaceutical product considered to be responsible for event
Control | 0..1
Type | CodeableConcept
34. EHDSAllergyIntolerance.reaction.manifestation
Definition | Description of the clinical manifestation of the allergic reaction. Example: anaphylactic shock, angioedema. (the clinical manifestation also gives information about the severity of the observed reaction).
Short | Description of the clinical manifestation of the allergic reaction. Example: anaphylactic shock, angioedema. (the clinical manifestation also gives information about the severity of the observed reaction).
Control | 0..*
Binding | ICD-10, SNOMED CT
Type | CodeableConcept
Requirements | The element is present in eHN PS GL, MyHealth@EU specifications and ISO IPS. Element name and description is taken from eHN PS GL. Cardinality in MyHealth@EU for this element, used here, is one manifestation per severity and onset, while the cardinality in FHIR IPS IG allows multiple manifestations per severity and onset.
36. EHDSAllergyIntolerance.reaction.severity
Definition | Severity of the clinical manifestation of the allergic reaction.
Short | Severity of the clinical manifestation of the allergic reaction.
Control | 0..1
Binding | SNOMED CT, HL7 reaction event severity
Type | CodeableConcept
Requirements | The element is present in eHN PS GL, MyHealth@EU specifications and ISO IPS. Element name and description is taken from eHN PS GL.
38. EHDSAllergyIntolerance.reaction.onset
Definition | Date and time of the onset of the reaction
Short | Date and time of the onset of the reaction
Control | 0..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Requirements | The element is present in eHN PS GL. Element name and description is taken from eHN PS GL.

Guidance on how to interpret the contents of this table can be foundhere

0. EHDSAllergyIntolerance
Definition | EHDS refined base model for allergy/intolerance
Short | Allergy intolerance model
Logical Model | Instances of this logical model are not marked to be the target of a Reference
2. EHDSAllergyIntolerance.header
4. EHDSAllergyIntolerance.header.author[x]
Definition | The author of the allergy/intolerance information.
Short | The author of the allergy/intolerance information.
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
6. EHDSAllergyIntolerance.header.status
Definition | Current status of the allergy or intolerance, for example, whether it is active, in remission, resolved, etc.
Short | Current status of the allergy or intolerance, for example, whether it is active, in remission, resolved, etc.
Binding | HL7 allergy intolerance status
Requirements | eHN PS Guideline, MyHealth@EU, ISO IPS
8. EHDSAllergyIntolerance.agentOrAllergen
Definition | Code for an allergy or intolerance statement (either a positive or a negated/excluded statement). This may be a code for a substance or pharmaceutical product that is considered to be responsible for the adverse reaction risk (e.g., "Latex"), an allergy or intolerance condition (e.g., "Latex allergy"), or a negated/excluded code for a specific substance or class (e.g., "No latex allergy") It must be clinically safe to only process the 'code' and ignore the 'reaction.substance'.
Short | Code that identifies the allergy or intolerance
Control | 1..1
Binding | ATC, EMA SPOR SMS, SNOMED CT
Type | CodeableConcept
Requirements | eHN PS Guideline, MyHealth@EU, ISO IPS
10. EHDSAllergyIntolerance.note
Definition | Additional information about the allergy or intolerance
Short | Additional information about the allergy or intolerance
Control | 0..1
Type | string
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Requirements | eHN PS Guideline, ISO IPS
12. EHDSAllergyIntolerance.criticality
Definition | Estimate of the potential clinical harm, or seriousness, of a reaction to an identified substance.
Short | Estimate of the potential clinical harm, or seriousness, of a reaction to an identified substance.
Control | 0..1
Binding | HL7 allergy intolerance criticality
Type | CodeableConcept
Requirements | eHN PS Guideline, MyHealth@EU, ISO IPS
14. EHDSAllergyIntolerance.certainty
Definition | Assertion about the certainty associated with a propensity, or potential risk, of a reaction to the identified substance. Diagnostic and /or clinical evidence of condition
Short | Assertion about the certainty associated with a propensity, or potential risk, of a reaction to the identified substance. Diagnostic and /or clinical evidence of condition
Control | 0..1
Binding | HL7 allergy intolerance verification
Type | CodeableConcept
Requirements | eHN PS Guideline, MyHealth@EU, ISO IPS
16. EHDSAllergyIntolerance.onsetDate
Definition | When allergy or intolerance was identified
Short | When allergy or intolerance was identified
Control | 0..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Requirements | MyHealth@EU, ISO IPS
18. EHDSAllergyIntolerance.endDate
Definition | Date of resolution of the allergy (e.g. when the clinician deemed there is no longer any need to track the underlying condition)
Short | Date of resolution of the allergy (e.g. when the clinician deemed there is no longer any need to track the underlying condition)
Control | 0..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Requirements | eHN PS Guideline, MyHealth@EU, ISO IPS
20. EHDSAllergyIntolerance.reaction
Definition | Adverse reaction events linked to exposure to substance.
Short | Adverse reaction events linked to exposure to substance.
Control | 0..*
Type | Base
Requirements | ISO IPS (explicit), implicitly in eHN PS Guideline, MH@EU
22. EHDSAllergyIntolerance.reaction.agentOrAllergen
Definition | Identification of the specific substance (or pharmaceutical product) considered to be responsible for the Adverse Reaction event. Note: the substance for a specific reaction may be different from the substance identified as the cause of the risk, but it must be consistent with it. It must be clinically safe to only process the 'code' and ignore the 'reaction.substance'.
Short | Specific substance or pharmaceutical product considered to be responsible for event
Control | 0..1
Type | CodeableConcept
24. EHDSAllergyIntolerance.reaction.manifestation
Definition | Description of the clinical manifestation of the allergic reaction. Example: anaphylactic shock, angioedema. (the clinical manifestation also gives information about the severity of the observed reaction).
Short | Description of the clinical manifestation of the allergic reaction. Example: anaphylactic shock, angioedema. (the clinical manifestation also gives information about the severity of the observed reaction).
Control | 0..*
Binding | ICD-10, SNOMED CT
Type | CodeableConcept
Requirements | The element is present in eHN PS GL, MyHealth@EU specifications and ISO IPS. Element name and description is taken from eHN PS GL. Cardinality in MyHealth@EU for this element, used here, is one manifestation per severity and onset, while the cardinality in FHIR IPS IG allows multiple manifestations per severity and onset.
26. EHDSAllergyIntolerance.reaction.severity
Definition | Severity of the clinical manifestation of the allergic reaction.
Short | Severity of the clinical manifestation of the allergic reaction.
Control | 0..1
Binding | SNOMED CT, HL7 reaction event severity
Type | CodeableConcept
Requirements | The element is present in eHN PS GL, MyHealth@EU specifications and ISO IPS. Element name and description is taken from eHN PS GL.
28. EHDSAllergyIntolerance.reaction.onset
Definition | Date and time of the onset of the reaction
Short | Date and time of the onset of the reaction
Control | 0..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Requirements | The element is present in eHN PS GL. Element name and description is taken from eHN PS GL.

Guidance on how to interpret the contents of this table can be foundhere

0. EHDSAllergyIntolerance
Definition | EHDS refined base model for allergy/intolerance
Short | Allergy intolerance model
Control | 0..*
Is Modifier | false
Logical Model | Instances of this logical model are not marked to be the target of a Reference
2. EHDSAllergyIntolerance.header
Definition | Basic metadata for this information
Short | Basic metadata for this information
Control | 1..1
Type | Base
4. EHDSAllergyIntolerance.header.subject
Definition | Patient/subject information
Short | Patient/subject information
Control | 1..1
Type | http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSPatient
6. EHDSAllergyIntolerance.header.identifier
Definition | Business identifier for the object, unique within its system. Supporting disambiguation between different contexts (systems/countries).
Short | Business identifier for the object, unique within its system. Supporting disambiguation between different contexts (systems/countries).
Note | This is a business identifier, not a resource identifier (see discussion)
Control | 0..*
Type | Identifier
8. EHDSAllergyIntolerance.header.author[x]
Definition | The author of the allergy/intolerance information.
Short | The author of the allergy/intolerance information.
Control | 0..*
Type | Choice of: http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSHealthProfessional, http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSOrganisation, http://www.xt-ehr.eu/fhir/models/StructureDefinition/EHDSDevice
[x] Note | SeeChoice of Data Typesfor further information about how to use [x]
10. EHDSAllergyIntolerance.header.date
Definition | Date and optionally time of authoring/issuing
Short | Date and optionally time of authoring/issuing
Control | 0..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
12. EHDSAllergyIntolerance.header.status
Definition | Current status of the allergy or intolerance, for example, whether it is active, in remission, resolved, etc.
Short | Current status of the allergy or intolerance, for example, whether it is active, in remission, resolved, etc.
Control | 1..1
Binding | HL7 allergy intolerance status
Type | CodeableConcept
Requirements | eHN PS Guideline, MyHealth@EU, ISO IPS
14. EHDSAllergyIntolerance.header.source
Definition | Source of information (e.g. patient, patient's proxy). Used in case the patient has authored the information or the author has submitted patient-stated information.
Short | Source of information (e.g. patient, patient's proxy). Used in case the patient has authored the information or the author has submitted patient-stated information.
Control | 0..1
Type | CodeableConcept
16. EHDSAllergyIntolerance.header.language
Definition | Language in which the resource is written. Language is expressed by the IETF language tag.
Short | Language in which the resource is written. Language is expressed by the IETF language tag.
Control | 0..1
Binding | BCP 47
Type | CodeableConcept
18. EHDSAllergyIntolerance.agentOrAllergen
Definition | Code for an allergy or intolerance statement (either a positive or a negated/excluded statement). This may be a code for a substance or pharmaceutical product that is considered to be responsible for the adverse reaction risk (e.g., "Latex"), an allergy or intolerance condition (e.g., "Latex allergy"), or a negated/excluded code for a specific substance or class (e.g., "No latex allergy") It must be clinically safe to only process the 'code' and ignore the 'reaction.substance'.
Short | Code that identifies the allergy or intolerance
Control | 1..1
Binding | ATC, EMA SPOR SMS, SNOMED CT
Type | CodeableConcept
Requirements | eHN PS Guideline, MyHealth@EU, ISO IPS
20. EHDSAllergyIntolerance.note
Definition | Additional information about the allergy or intolerance
Short | Additional information about the allergy or intolerance
Control | 0..1
Type | string
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Requirements | eHN PS Guideline, ISO IPS
22. EHDSAllergyIntolerance.criticality
Definition | Estimate of the potential clinical harm, or seriousness, of a reaction to an identified substance.
Short | Estimate of the potential clinical harm, or seriousness, of a reaction to an identified substance.
Control | 0..1
Binding | HL7 allergy intolerance criticality
Type | CodeableConcept
Requirements | eHN PS Guideline, MyHealth@EU, ISO IPS
24. EHDSAllergyIntolerance.certainty
Definition | Assertion about the certainty associated with a propensity, or potential risk, of a reaction to the identified substance. Diagnostic and /or clinical evidence of condition
Short | Assertion about the certainty associated with a propensity, or potential risk, of a reaction to the identified substance. Diagnostic and /or clinical evidence of condition
Control | 0..1
Binding | HL7 allergy intolerance verification
Type | CodeableConcept
Requirements | eHN PS Guideline, MyHealth@EU, ISO IPS
26. EHDSAllergyIntolerance.onsetDate
Definition | When allergy or intolerance was identified
Short | When allergy or intolerance was identified
Control | 0..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Requirements | MyHealth@EU, ISO IPS
28. EHDSAllergyIntolerance.endDate
Definition | Date of resolution of the allergy (e.g. when the clinician deemed there is no longer any need to track the underlying condition)
Short | Date of resolution of the allergy (e.g. when the clinician deemed there is no longer any need to track the underlying condition)
Control | 0..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Requirements | eHN PS Guideline, MyHealth@EU, ISO IPS
30. EHDSAllergyIntolerance.reaction
Definition | Adverse reaction events linked to exposure to substance.
Short | Adverse reaction events linked to exposure to substance.
Control | 0..*
Type | Base
Requirements | ISO IPS (explicit), implicitly in eHN PS Guideline, MH@EU
32. EHDSAllergyIntolerance.reaction.agentOrAllergen
Definition | Identification of the specific substance (or pharmaceutical product) considered to be responsible for the Adverse Reaction event. Note: the substance for a specific reaction may be different from the substance identified as the cause of the risk, but it must be consistent with it. It must be clinically safe to only process the 'code' and ignore the 'reaction.substance'.
Short | Specific substance or pharmaceutical product considered to be responsible for event
Control | 0..1
Type | CodeableConcept
34. EHDSAllergyIntolerance.reaction.manifestation
Definition | Description of the clinical manifestation of the allergic reaction. Example: anaphylactic shock, angioedema. (the clinical manifestation also gives information about the severity of the observed reaction).
Short | Description of the clinical manifestation of the allergic reaction. Example: anaphylactic shock, angioedema. (the clinical manifestation also gives information about the severity of the observed reaction).
Control | 0..*
Binding | ICD-10, SNOMED CT
Type | CodeableConcept
Requirements | The element is present in eHN PS GL, MyHealth@EU specifications and ISO IPS. Element name and description is taken from eHN PS GL. Cardinality in MyHealth@EU for this element, used here, is one manifestation per severity and onset, while the cardinality in FHIR IPS IG allows multiple manifestations per severity and onset.
36. EHDSAllergyIntolerance.reaction.severity
Definition | Severity of the clinical manifestation of the allergic reaction.
Short | Severity of the clinical manifestation of the allergic reaction.
Control | 0..1
Binding | SNOMED CT, HL7 reaction event severity
Type | CodeableConcept
Requirements | The element is present in eHN PS GL, MyHealth@EU specifications and ISO IPS. Element name and description is taken from eHN PS GL.
38. EHDSAllergyIntolerance.reaction.onset
Definition | Date and time of the onset of the reaction
Short | Date and time of the onset of the reaction
Control | 0..1
Type | dateTime
Primitive Value | This primitive element may be present, or absent, or replaced by an extension
Requirements | The element is present in eHN PS GL. Element name and description is taken from eHN PS GL.