Unique Device Identification (UDI)

GS1 is an UDI Issuing Agency/Entity based on many regulations worldwide, in particular US, EU, China, South Korea, Saudi Arabia.

UDI (Unique Device Identification)

Disclaimer: Neither GS1 nor its member organisations nor their staff have real or apparent authority to speak for the regulatory authorities or grant exemptions. GS1 offers advisory services focused on GS1 standards, after a supplier’s staff including its internal regulatory experts have determined the correct path to compliance. GS1 is a voluntary organisation and its members have and must continue to determine their own course of action. GS1 provides recommendations. GS1 Global Office, GS1 member organisations and GS1 staff assume no liability for members actions taken upon its advice.

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What is UDI?

A Unique Device Identification (UDI) system is intended to provide single, globally harmonized positive identification of medical devices through distribution and use, requiring the label of devices to bear a globally unique device identifier (to be conveyed by using Automatic Identification and Data Capture and, if applicable, its Human Readable Interpretation) based upon standard, with the UDI-DI (Device Identifier) of that unique identifier being also linked to a jurisdiction-specific public UDI database (source: International Medical Device Regulators Forum (IMDRF): http://www.imdrf.org/).

UDI infographic

The United States Food and Drug Administration (FDA), the European Commission and other regulators have made patient safety a strategic priority by developing UDI regulations for Medical Devices and In Vitro Diagnostic (IVD) Devices and are aiming for a globally harmonised and consistent approach aligned on the IMDRF Guidelines.

medical devices

UDI and GS1

GS1 is an UDI Issuing Agency/Entity based on many regulations worldwide, in particular US, EU, China, South Korea, Saudi Arabia, meaning that manufacturers supplying regulated medical devices to these markets can use the GS1 standards to implement the UDI requirements.

The GS1 system of standards provides a global framework to identify, capture and share Healthcare product information, thereby enabling a consistent worldwide implementation of UDI. UDI regulatory requirements have a translation into GS1 standards as shown in the table.

GS1 Member Organisations are the ones issuing GS1 Company Prefixes (GCP) enabling the generation of GS1 identification keys. They also provide direct support on the use of GS1 standard to implement UDI requirements worldwide.

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UDI regulatory requirements GS1 Standards
Basic UDI-DI
« New » level of identification in
the EU
GMN (Global Model Number)
No Application Identifier (AI) for
regulated medical devices
UDI-DI *
Device Identifier (DI)
GTIN *
Global Trade Item Number
UDI-PI *
Production Identifier (PI)
(if applicable)
AI * Application Identifier (AI)
  • Expiration date AI(17) - e.g. 141120
  • Batch - lot AI(10) - e.g. 1234AB
  • Serial number AI(21) - e.g. 12345XYZ
  • Manufacture date AI(11) - e.g. 250717
Product Identifier data will vary by medical device typeand manufacturer current practice
UDI-DI + UDI-PI = UDI GTIN or GTIN + AI(s) = UDI
* The HRI (Human Readable Information) format shall follow the rules of
the UDI Issuing Entity

The US Food and Drug Administration (FDA) released in September 2013 a UDI rule which establishes a UDI system applying to all medical devices placed on the US market.

On 17 December 2013, GS1 has been accredited by the US FDA as issuing agency for unique device identifiers (UDIs). GS1 standards meet the US FDA’s criteria for issuing UDIs. GS1 Member Organisations across the world will help manufacturers comply with the requirements of the US FDA UDI regulation, to support patient safety and supply chain security.

Regulated product data must be submitted to the Global Unique Device Identification Database (GUDID), i.e. the US FDA UDI regulatory database.

UDI requirements compliance dates in the US can be found here.

The EU Medical Device Regulation (MDR) and In-vitro Diagnostic Regulation (IVDR) were adopted on 5 April 2017 and define the requirements for the EU UDI system.

On 7 June 2019, GS1 was designated by the European Commission as an issuing entity for Unique Device Identifiers (UDIs). GS1 standards are enabling healthcare manufacturers from around the world to create and maintain UDI numbers by following the EU Regulations and the GS1 General Specifications.

Required product data will be submitted to EUDAMED, i.e. the EU regulatory database for regulated medical devices.

The EU Regulations have introduced a new concept: the Basic UDI-DI, that aims at grouping regulated medical devices under the same identifier. GS1 has developed a new key to support the implementation of the Basic UDI-DI: the Global Model Number (GMN). The GMN generator tool helps generate the GMN (Basic UDI-DI), calculate the related check character pair or verify your GMN (Basic UDI-DI).

Compliance dates for UDI requirements and complementary information by type of actor in the EU are available in the European Commission’s website in the section “Getting ready for the new regulations”.

The European Commission is working on implementation details and is regularly publishing complementary guidances.

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