HL7 Europe Base and Core FHIR IG
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## Logical Models

### EHDS Logical Data Models

Logical data models (or information models) for the European Health Data Space (EHDS) are currently being developed by the Xt-EHR Joint Action. These models will form the basis of the Joint Action’s proposal for the future EHDS Implementing Act.

They represent evolving, refined interpretations of the data sets described in the eHealth Network (eHN) Guidelines, and are expected to be further updated during the Joint Action process.

This Implementation Guide (IG) aims to align with the emerging EHDS logical models and to provide HL7 FHIR profiles that *realise the requirements identified in these models

The EHDS logical models currently supported in this version of the guide are listed below. For the most recent and in-progress versions, please refer to the Xt-EHR EHDS Logical Information Models Implementation Guide.

Ongoing alignment: The Xt-EHR logical models are under active revision and continuous refinement. Updates from Xt-EHR will be progressively incorporated into this Implementation Guide to maintain alignment with the evolving EHDS specifications.

### Xt-EHR Logical Models

#### 🧩 Foundational Models

Model | Description
--- | ---
EHDSAddress | EHDS refined base model for Address structure
EHDSHumanName | EHDS refined base model for Human Name
EHDSTelecom | EHDS refined base model for telecommunications and contact details
EHDSBodyStructure | EHDS refined base model for Body structure

#### 🧑‍⚕️ Entity Models

Model | Description
--- | ---
EHDSPatient | EHDS refined base model for Patient (subject of care)
EHDSPatientAnimal | EHDS refined base model for Animal Patient
EHDSHealthProfessional | EHDS refined base model for Health Professional
EHDSOrganisation | EHDS refined base model for healthcare organisations and providers
EHDSLocation | EHDS refined base model for location, site, or service delivery place

#### 🩺 Clinical Information Models

Model | Description
--- | ---
EHDSAlert | EHDS refined base model for clinical alerts
EHDSAllergyIntolerance | EHDS refined base model for allergy or intolerance information
EHDSCondition | EHDS refined base model for a clinical condition, problem, diagnosis, or other event, situation, issue, or clinical concept that has risen to a level of concern
EHDSObservation | EHDS refined base model for medical test results and other clinical observations
EHDSProcedure | EHDS refined base model for an action that is or was performed on or for a patient
EHDSImmunisation | EHDS refined base model for immunisation

#### 📄 Document Models

Model | Description
--- | ---
EHDSDocument | EHDS refined base model for clinical documents, including header, authorship, attestation, and legal metadata

#### 💊 Medication Models

Model | Description
--- | ---
EHDSMedication | Logical model for prescribed/dispensed medication. Shared by statements, requests, dispensations, and treatment lines. Supports both generic (virtual) and branded (real) products.
EHDSMedicationStatement | Statement about a single medication as part of a medication summary