EU UDI After EUDAMED: What Is Still Due in 2027 and What It Means for Your Labels
Every deadline for putting a UDI carrier on an MDR label has now passed, and EUDAMED became mandatory on 28 May 2026. If you sell devices in the EU, the labelling question is no longer "when do I have to start" — it is "does what I already print actually pass". Two dates are still ahead, both on 26 May 2027, and both land on the printing side rather than the paperwork side.
Key points
- All MDR label-carrier deadlines are behind us — Class III/implantable 2021, Class IIa/IIb 2023, Class I 2025.
- Still ahead, 26 May 2027: direct marking of reusable Class I devices (MDR), and UDI carriers on labels for Class A IVDs (IVDR).
- EUDAMED has been mandatory since 28 May 2026 for its first four modules, including UDI/Device registration.
- The carrier must carry both AIDC and HRI — machine-readable and plain characters — unless space constraints genuinely prevent it, in which case AIDC alone is required on the label.
- GS1 healthcare application standards call for a print quality grade of at least 1.5 / C under ISO/IEC 15415. A code that decodes on your desk can still fail this.
1. Where the deadlines actually stand
The European Commission's own UDI helpdesk publishes the schedule. As of September 2026 it reads like this:
| Requirement | Device class | Date | Status |
|---|---|---|---|
| MDR — UDI carrier on the label | Implantable and Class III | 26 May 2021 | passed |
| Class IIa and Class IIb | 26 May 2023 | passed | |
| Class I | 26 May 2025 | passed | |
| MDR — direct marking of reusable devices | Implantable and Class III | 26 May 2023 | passed |
| Class IIa and Class IIb | 26 May 2025 | passed | |
| Class I | 26 May 2027 | ahead | |
| IVDR — UDI carrier on the label | Class D | 26 May 2023 | passed |
| Class C and Class B | 26 May 2025 | passed | |
| Class A | 26 May 2027 | ahead |
Separately, Commission Decision (EU) 2025/2371 was published on 27 November 2025 declaring the first four EUDAMED modules functional, which started a six-month transition. Since 28 May 2026 those four modules — Actor registration, UDI/Device registration, Notified Bodies & Certificates, and Market Surveillance — are mandatory. New devices must be registered in the UDI/Device module before they are placed on the market.
For devices already on the market before 28 May 2026, industry guidance widely cites a twelve-month window to complete registration, which would fall in late November 2026. The Commission's own announcement page states only the 28 May 2026 mandatory date. Confirm the legacy-device date against the Commission's current guidance or your notified body rather than against a vendor blog — this one has been reported inconsistently.
2. What "UDI carrier" means on a label
MDR Annex VI Part C defines the carrier as the means of conveying the UDI using AIDC and, where applicable, its HRI. In practice that means two representations of the same data:
- AIDC — the machine-readable symbol. In healthcare this is normally a GS1 DataMatrix, sometimes GS1-128 on larger packaging.
- HRI — the human-readable interpretation: the same identifiers printed as characters a person can read without a scanner.
Both encode the UDI-DI (static, per model and packaging level) and the applicable UDI-PI elements (lot, serial, manufacturing date, expiry date, software version). The carrier goes on the label and on all higher levels of packaging — shelf carton, shipper, pallet — not just the primary label.
There is one relief valve: if significant constraints genuinely limit the use of both formats, only the AIDC format is required on the label. This is an exception for physically tiny devices, not a general convenience. If your label is 40 × 25 mm and merely crowded, the answer is a bigger label or a fold-out, not dropping the HRI.
3. The 2027 item that is a printing problem: direct marking
Direct marking is the requirement that a reusable device carry its UDI on the device itself, so it remains identifiable after its packaging is gone. For reusable Class I devices under MDR that obligation applies from 26 May 2027.
This is a different discipline from label printing, and it is worth separating the options honestly:
| Method | Suits | Watch out for |
|---|---|---|
| Laser marking / etching | Stainless steel instruments, reusable metal components | Contrast comes from surface texture, not ink — grading uses the DPM methodology, not plain ISO/IEC 15415 |
| Chemical etch | Instruments where laser heat input is a concern | Edge definition is harder to control; validate on production substrate |
| Permanent label | Devices with a flat, non-critical surface that survive the reprocessing cycle | Must survive repeated autoclaving, washer-disinfector chemistry and handling — this is where ordinary label stock fails |
If you are considering a label rather than marking the substrate, the sterilization cycle is the constraint that decides everything. Repeated steam autoclave exposure at 134 °C plus alkaline washer-disinfector chemistry will delaminate, yellow or lift most standard face stocks and adhesives. Ask your supplier for material that is specified for the exact reprocessing cycle you validate against, and test it through the number of cycles the device is rated for — not once.
4. Print quality: the part that fails audits
A UDI symbol is not "fine" because your phone reads it. GS1 healthcare application standards call for a minimum print quality grade of 1.5 (grade C) assessed under ISO/IEC 15415, the standard for 2D symbol quality. Auditors and trading partners grade with a verifier, not a phone camera — phones apply aggressive image processing that recovers symbols a fixed-focus industrial imager will reject.
The parameters that most often push a DataMatrix below grade C in real production:
- Module size too small for the process. Every printing method has a floor. Thermal transfer at 300 dpi cannot hold the same module size as flexo on coated stock. The X-dimension has to be chosen against the actual press and substrate, and the permitted range is set by the GS1 General Specifications for your application — read that rather than copying a number from a blog.
- Print growth. Ink spread or ribbon over-energy thickens dark modules until the grid distorts. Reduce heat or dot gain before reducing module size.
- Quiet zone encroachment. A DataMatrix needs a clear margin of one module on all four sides; artwork borders and die-cut tolerance eat it.
- Contrast on the substrate. Matte synthetic and metallised stocks behave very differently from coated paper under a verifier's illumination.
- Axial and grid non-uniformity from web tension or an unevenly worn printhead — invisible to the eye, immediately visible to a verifier.
Practical rule: grade a sample from the start, middle and end of a production run, on the actual substrate, with a verifier. A run that starts at grade B and ends at grade D because the printhead heated up is a run that will be rejected somewhere downstream — and you will not know from looking at it.
5. A checklist before your next artwork release
- Confirm your class and date. Reusable Class I under MDR, or Class A IVD — you have work due 26 May 2027. Everything else on labels is already in force.
- Check EUDAMED registration status for every DI, including devices already on the market.
- Verify both AIDC and HRI are present on the label and on every higher packaging level, and that the HRI matches what the symbol encodes character for character.
- Confirm the PI elements are the right ones for the device — a serial where you print a lot number is a data error that no barcode grade will catch.
- Grade the symbol with a verifier on production substrate, at multiple points in the run, against ISO/IEC 15415 grade 1.5 / C.
- For reusable devices, validate the mark through the full reprocessing cycle count, not a single pass.
To assemble the AI string and see the symbol before you commit artwork, the UDI generator builds a GS1 DataMatrix or GS1-128 with the human-readable line from a GTIN plus lot, serial and dates. For the question of who issues your numbers in the first place, see UDI issuing agencies compared.
Generate a UDI barcode and its human-readable line
Enter GTIN, lot, serial and expiry; the tool assembles the Application Identifier string and renders GS1 DataMatrix or GS1-128 with the HRI. Open the tool →
References
This article is based on the following primary sources; always check the edition in force before shipping or labelling.
- European Commission UDI Helpdesk — UDI carrier deadlines by device class
- European Commission — The four first EUDAMED modules will be mandatory to use as from 28 May 2026
- European Commission — EUDAMED UDI/Device registration
- European Commission — Unique Device Identifier (UDI) under MDR/IVDR
- GS1 — DataMatrix Guideline (symbol quality and application rules)
- GS1 — General Specifications (X-dimension ranges and symbol placement)
- ISO/IEC 15415 — Bar code symbol print quality test specification, two-dimensional symbols
Frequently asked questions
Are there any EU UDI label deadlines still ahead?
For labels under MDR, no — the last one was Class I on 26 May 2025. Two obligations remain: direct marking of reusable Class I devices under MDR, and UDI carriers on labels for Class A IVDs under IVDR. Both fall on 26 May 2027.
Is EUDAMED registration mandatory now?
Yes. Commission Decision (EU) 2025/2371, published 27 November 2025, started a six-month transition, and the first four EUDAMED modules — Actor registration, UDI/Device registration, Notified Bodies & Certificates, and Market Surveillance — have been mandatory since 28 May 2026. New devices must be registered in the UDI/Device module before being placed on the market. For devices already on the market before that date, confirm the current registration deadline with the Commission's guidance or your notified body; it has been reported inconsistently by secondary sources.
Do I have to print both the barcode and the human-readable text?
Yes, as a rule. MDR Annex VI Part C requires the UDI carrier to present the UDI in AIDC form and, where applicable, its HRI. Only where significant constraints genuinely limit the use of both formats is AIDC alone required on the label. That exception is for physically very small devices, not for crowded artwork.
What print quality grade does a UDI DataMatrix need?
GS1 healthcare application standards call for a minimum of grade 1.5 (grade C) assessed under ISO/IEC 15415. Grade it with a barcode verifier on the production substrate, not with a phone — phone cameras apply image processing that recovers symbols an industrial fixed-focus imager will reject.
Can I meet direct marking with a label instead of etching the device?
Sometimes. The requirement is that the UDI remains on the device once the packaging is gone, so the method is open — but the mark has to survive the device's full validated reprocessing cycle. Repeated steam autoclaving and alkaline washer-disinfector chemistry will lift or degrade ordinary label stock. If you go the label route, specify material for that exact cycle and test through the rated number of cycles, not a single pass.
Does the UDI carrier go on every packaging level?
Yes. MDR requires the carrier on the label and on all higher levels of device packaging. Shipping containers are the exception normally cited — a container carrying multiple devices for transport is not a "higher packaging level" in this sense.