HL7 Europe Base and Core FHIR IG
2.0.0 - trial-use 150

HL7 Europe Base and Core FHIR IG, published by HL7 Europe. This guide is not an authorized publication; it is the continuous build for version 2.0.0 built by the FHIR (HL7® FHIR® Standard) CI Build. This version is based on the current content of https://github.com/patrick-werner/base/ and changes regularly. See the Directory of published versions

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Official URL: http://hl7.eu/fhir/base/ImplementationGuide/hl7.fhir.eu.base | Version: 2.0.0
Active as of 2026-08-07 | Computable Name: Hl7EuBaseIg
Copyright/Legal: Copyright HL7 Europe. Licensed under creative commons public domain (CC0 1.0).

Acknowledgment
The development of this Implementation Guide version has been supported by the Xt-EHR Joint Action. Xt-EHR provided expertise, alignment with European health policy priorities, and validation of specifications to enable consistency with EHDS requirements.

### Scope

This Implementation Guide (IG) brings together base and core HL7® FHIR® artifacts designed specifically for the European context.

It provides a foundation for interoperability and reusability across national projects, European initiatives, and derived HL7 Europe guides.

The guide supports:

- Developers and implementers who need common building blocks.

- Policymakers and program leads who require consistent definitions for EHDS-aligned projects.

- Standards experts who wish to build on a harmonized European foundation.

### Introduction

The HL7 Europe Base and Core Implementation Guide provides a layered approach to FHIR interoperability in the European context; and it aims to support a coherent and reusable set of FHIR specifications across Europe.

It includes:

- Base profiles. Loosely constrained baseline definitions of common European concepts (e.g., Patient, Practitioner). They provide flexibility and serve as the foundation for Core and derived profiles.

- Core profiles. More constrained profiles designed for reuse across most European IGs. They introduce essential constraints, can often be used directly, and pursue alignment with IPS.

See the Introduction page for detailed explanations of Base and Core profiles, their relationship with Extensions and scoped IGs, and their alignment with EHDS and IPS.

Fig. 1 - European Base and Core profiles

### Guide Publication

This guide is published for two HL7 FHIR versions:

- HL7 FHIR R4 Base IG (hl7.fhir.eu.base). This Guide.
- HL7 FHIR R5 Base IG (hl7.fhir.eu.base-r5). Published at the HL7 Europe Base R5 page.

Both versions are maintained by HL7 Europe and evolve based on community feedback and EHDS requirements.