Notes · 30 September 2026
What is a UDI-DI?
A UDI-DI is the device identifier in the EU Unique Device Identification system. It names the device model in EUDAMED, not one physical unit.
A UDI-DI is the device identifier half of a Unique Device Identifier. In the EU it is the code under which a medical device model is registered in EUDAMED. People search for it when a label, a tender, or a supplier spreadsheet shows a long code and they need to know which record that code points at.
The other half is the UDI-PI, the production identifier: lot, serial number, manufacturing date, expiry date, or a software version. The UDI-DI stays the same for that device model. The UDI-PI changes per batch or unit. EUDAMED’s public device module is built around the UDI-DI (and the basic UDI-DI). It is not a database of every serial number that left a factory.
What the public record usually shows
A public UDI-DI page can include the trade name, the manufacturer’s name and SRN, the risk class, a catalogue reference, the applicable legislation (MDR or IVDR), and the market status. The status is one of three values the register uses: on the market, no longer on the market, or not intended for the EU market. Those words are the ones that matter if you are deciding whether a code on a shelf is still placed on the Union market.
Two live examples on this site, read from the public API and not invented:
- UDI-DI 16977660098955, trade name suction Catheter, manufacturer JianLin Medical Import&Export Co.,LTD, SRN CN-MF-000042120, Class I. The public certificate search does not return an expiry for it.
- UDI-DI 10887714028257, Covered CP Stent, NuMED, Class III. A certificate date is present in the public record.
If a field is empty, that is what the public response contained. It is not the same as proof that the field does not exist inside a restricted EUDAMED workspace.
UDI-DI is not the basic UDI-DI
The basic UDI-DI groups device models that share an intended purpose, risk class, and essential design. Notified-body certificates in EUDAMED are attached to that group. Searching only the UDI-DI from a label can miss the certificate, because the certificate search is keyed by the basic UDI-DI. The device page on UdiWatch follows that link when the register provides it.
What is worth watching
A UDI-DI that never changes is a lookup. A UDI-DI whose market status, trade name, risk class, reference, version, or published certificate changes is an operations problem: stock, a tender annex, or a technical file that still quotes the old state. UdiWatch stores the first public snapshot as a baseline and reports a later difference. It does not alert just because a field was missing on the next read.
This site is not the European Commission register and not a notified body. The official public search is on EUDAMED. Use that when you need the Commission’s own screen. Use a watch when you need to hear that the screen changed.
More notes
Not an official European Commission page. Public device and actor pages on this site repeat fields the register already publishes.