MDR Article 27

Article 27

Unique Device Identification system

1. The Unique Device Identification system (‘UDI system’) described in Part C of Annex VI shall allow the identification and facilitate the traceability of devices, other than custom-made and investigational devices, and shall consist of the following:

(a) production of a UDI that comprises the following:

(i) a UDI device identifier (‘UDI-DI’) specific to a manufacturer and a device, providing access to the information laid down in Part B of Annex VI;

(ii) a UDI production identifier (‘UDI-PI’) that identifies the unit of device production and if applicable the packaged devices, as specified in Part C of Annex VI;

(b) placing of the UDI on the label of the device or on its packaging;

(c) storage of the UDI by economic operators, health institutions and healthcare professionals, in accordance with the conditions laid down in paragraphs 8 and 9 of this Article respectively;

(d) establishment of an electronic system for Unique Device Identification (‘UDI database’) in accordance with Article 28.

2. The Commission shall, by means of implementing acts, designate one or several entities to operate a system for assignment of UDIs pursuant to this Regulation (‘issuing entity’). That entity or those entities shall satisfy all of the following criteria:

(a) the entity is an organisation with legal personality;

(b) its system for the assignment of UDIs is adequate to identify a device throughout its distribution and use in accordance with the requirements of this Regulation;

(c) its system for the assignment of UDIs conforms to the relevant international standards;

(d) the entity gives access to its system for the assignment of UDIs to all interested users in accordance with a set of predetermined and transparent terms and conditions;

(e) the entity undertakes to do the following:

(i) operate its system for the assignment of UDIs for at least 10 years after its designation;

(ii) make available to the Commission and to the Member States, upon request, information concerning its system for the assignment of UDIs;

(iii) remain in compliance with the criteria for designation and the terms of designation.

When designating issuing entities, the Commission shall endeavour to ensure that UDI carriers, as defined in Part C of Annex VI, are universally readable regardless of the system used by the issuing entity, with a view to minimising financial and administrative burdens for economic operators and health institutions.

3. Before placing a device, other than a custom-made device, on the market, the manufacturer shall assign to the device and, if applicable, to all higher levels of packaging, a UDI created in compliance with the rules of the issuing entity designated by the Commission in accordance with paragraph 2.

Before a device, other than a custom-made or investigational device, is placed on the market the manufacturer shall ensure that the information referred to in Part B of Annex VI of the device in question are correctly submitted and transferred to the UDI database referred to in Article 28.

4. UDI carriers shall be placed on the label of the device and on all higher levels of packaging. Higher levels of packaging shall not be understood to include shipping containers.

5. The UDI shall be used for reporting serious incidents and field safety corrective actions in accordance with Article 87.

6. The Basic UDI-DI, as defined in Part C of Annex VI, of the device shall appear on the EU declaration of conformity referred to in Article 19.

7. As part of the technical documentation referred to in Annex II, the manufacturer shall keep up-to-date a list of all UDIs that it has assigned.

8. Economic operators shall store and keep, preferably by electronic means, the UDI of the devices which they have supplied or with which they have been supplied, if those devices belong to:

— class III implantable devices;

— the devices, categories or groups of devices determined by a measure referred to in point (a) of paragraph 11.

9. Health institutions shall store and keep preferably by electronic means the UDI of the devices which they have supplied or with which they have been supplied, if those devices belong to class III implantable devices.

For devices other than class III implantable devices, Member States shall encourage, and may require, health institutions to store and keep, preferably by electronic means, the UDI of the devices with which they have been supplied.

Member States shall encourage, and may require, healthcare professionals to store and keep preferably by electronic means, the UDI of the devices with which they have been supplied with.

10. The Commission is empowered to adopt delegated acts in accordance with Article 115:

(a) amending the list of information set out in Part B of Annex VI in the light of technical progress; and

(b) amending Annex VI in the light of international developments and technical progress in the field of Unique Device Identification.

11. The Commission may, by means of implementing acts, specify the detailed arrangements and the procedural aspects for the UDI system with a view to ensuring its harmonised application in relation to any of the following:

(a) determining the devices, categories or groups of devices to which the obligation laid down in paragraph 8 is to apply;

(b) specifying the data to be included in the UDI-PI of specific devices or device groups;

The implementing acts referred to in the first subparagraph shall be adopted in accordance with the examination procedure referred to in Article 114(3).

12. When adopting the measures referred to in paragraph 11, the Commission shall take into account all of the following:

(a) confidentiality and data protection as referred to in Articles 109 and 110 respectively;

(b) the risk-based approach;

(c) the cost-effectiveness of the measures;

(d) the convergence of UDI systems developed at international level;

(e) the need to avoid duplications in the UDI system;

(f) the needs of the healthcare systems of the Member States, and where possible, compatibility with other medical device identification systems that are used by stakeholders.


What is BUDI – Basic UDI-DI?
Basic UDI-DI is a unique UDI requirement in the EU, so there are no corresponding codes available outside the EU. This has caused and continues to cause some confusion.

Basic UDI-DI is a kind of collective code used to cover devices with the same or similar:

  • intended purpose,
  • risk class,
  • essential design, and
  • manufacturing characteristics.

Basic UDI-DI will NOT be found on any devices or packaging. It is only a collective term for grouping devices and reporting in EUDAMED. The Basic UDI-DI is decided by the manufacturer itself and according to their designated issuing entity (like GS-1 or HIBCC).

The purpose of the Basic UDI-DI is to act as the primary key in EUDAMED and for relevant documentation like certificates, declarations of conformity, technical documentation, Periodic Safety Update Reports (PSUR), Summary of Safety and Clinical Performance (SSCP) as well as certificates of free sales.

One Basic UDI-DI can cover several UDIs, but a UDI cannot be included in several Basic UDI-DIs.
The actual UDI is split into two parts:

  • The UDI-DI where the DI stands for Device Identifier
  • The UDI-PI where the PI stands for Production Identifier

The UDI-DI part is mandatory for ALL medical devices, while UDI-PI is only applicable where labelling must include production-related information, for example:

  • The lot number,
  • Serial number,
  • Software release, or
  • Expiry date

A UDI-PI is required for all medical device classes if the expiry or manufacturing date is crucial for a device. Any essential information on the label that is defined during production will require a UDI-PI.

Relevant courses

Find out more about the requirements by registering for the MDR course below:

Relevant templates


Applicable MDCG guidance documents

MDCG 2022-7 Q&A on the Unique Device Identification system under Regulation (EU) 2017/745 and Regulation

MDCG 2021-19 Guidance note integration of the UDI within an organisation’s quality management system

MDCG 2021-10 The status of Appendixes E-I of IMDRF N48 under the EU regulatory framework for medical devices

MDCG 2021-09 MDCG Position Paper on the Implementation of UDI requirements for contact lenses, spectacle frames, spectacle lenses & ready readers

MDCG 2018-1 Guidance on basic UDI-DI and changes to UDI-DI

MDCG 2020-18 MDCG Position Paper on UDI assignment for Spectacle lenses & Ready readers

MDCG 2019-2 Guidance on application of UDI rules to device-part of products referred to in article 1(8), 1(9) and 1(10) of Regulation 745/2017

MDCG 2019-1S MDCG guiding principles for issuing entities rules on basic UDI-DI

MDCG 2018-7 Provisional considerations regarding language issues associated with the UDI database

MDCG 2018-6 Clarifications of UDI related responsibilities in relation to article 16

MDCG 2018-5 UDI assignment to medical device software

MDCG 2018-4 Definitions/descriptions and formats of the UDI core elements for systems or procedure packs

Relevant blog posts

Find out more about the requirements by registering for the MDR course below:

YouTube videos

About the author

Pontus Gedda - Medical Device HQ instructor

Pontus Gedda

Pontus Gedda is a dedicated medical device specialist that has worked both in the industry, as a design engineer and project manager, and in the notified body world as a medical device lead auditor and manager.

He has vast experience in the MDR and its implementation through hands-on experience from implementing the MDR at a notified body and leading that notified body through a joint assessment and getting designated as an MDR notified body.

He was a senior manager at a notified body during the transition from MDD to MDR and also a member of the NB-MED group.

MedicalDeviceHQ Menu logo

Medical Device HQ
In-house training, public and online courses on managing and developing safe medical devices

Table of Contents

Recent Articles

Sign up to our newsletter now.

Sign up to our newsletter so you don’t miss the latest course updates and access to free resources and tools.
When you submit this form, you will be sending personal information to To comply with GDPR requirements, we need your consent to store and use the personal data you submit. Take a look at our Privacy policy for more details.