# How To Read - MyHealth@Eu MVC package v9.1.0

* [**Table of Contents**](toc.md)
* **How To Read**

## How To Read

**⚠️ Important Notice**

The authoritative source of truth for all MyHealth@EU terminology content is the
**MyHealth@EU Central Terminology Server**. This FHIR package is provided solely as supporting material to facilitate FHIR-based implementations. In case of any discrepancy between this package and the Central Terminology Server, the Central Terminology Server prevails.

**At a glance – MyHealth@EU MVC Package**
* **Purpose:** Master Value Sets Catalog (MVC) providing the eHDSI-prefixed terminology used across all MyHealth@EU domain IGs.
* **Content:** Value sets and code systems covering clinical domains including medications, lab, imaging, allergies, procedures, vaccinations, and more.
* **Usage:** Consumed as a dependency by all MyHealth@EU domain-specific IGs (Core, ePrescription, HDR, Laboratory, Vaccination, Imaging).
* **Goal:** Provide a single, consistent terminology foundation for cross-border health data exchange across EU Member States.

### Overview

This package:

* Provides **eHDSI-prefixed value sets and code systems** shared across all MyHealth@EU domain-specific IGs.
* Covers clinical terminology for all MyHealth@EU use cases including ePrescription, eDispensation, Hospital Discharge Report, Laboratory Report, Vaccination, and Medical Imaging.
* Is maintained as a standalone package to allow independent versioning and release of terminology content.

### What is in this Package

This package contains:

1. **Value Sets**— eHDSI-prefixed value sets (e.g.`eHDSIActiveIngredient`,`eHDSIVaccine`,`eHDSILabCode`) binding clinical concepts to agreed code systems such as SNOMED CT, LOINC, ATC, EDQM, and others.
1. **Code Systems**— a locally defined code system providing display labels for eHDSI-specific concepts.

A detailed description on how to read HL7 FHIR Implementation Guides is provided in the [Reading Implementation Guides](https://build.fhir.org/ig/FHIR/ig-guidance/readingIgs.html) guide.

### Terminology Naming Convention

Value sets follow the pattern `eHDSI<Domain><Concept>` (e.g. `eHDSIActiveIngredient`, `eHDSIVaccine`, `eHDSILabCode`).

Value set canonical URLs use: `http://terminology.ehdsi.eu/ValueSet/{resourceId}`.

### Versioning

This package is versioned independently from the MyHealth@EU domain IGs. Domain IGs reference a specific version of this package as a dependency. Updates to terminology content are released as new versions of this package without requiring changes to the domain IGs.

