Unique Device Identifier (UDI) according to EU MDR
Unique Device Identification (UDI) Under EU MDR Guide
"Why?" Because It's More Than Just A Sticker
Consider a hospital rack storing 500 indistinguishable looking packs of hip implants. A particular lot in this bunch contains a production fault, and this leads to fractures within 6 months.
In the absence of UDI: The medical staff will have to physically inspect each box on the shelf by comparing its code with a paper list. The process will take weeks. The patients will get the faulty implants during this time.
With UDI: The hospital ERP system will scan a barcode and identify the exact patient who was administered the faulty lot by saying, "Stop! Do not use this box."
The Bottom Line: UDI (Unique Device Identification) is not just a pile of paper. It is a "license plate" that makes tracking of a device possible from our factory to your body.
The Anatomy Of A UDI (Don't Mix These Up!)
The #1 cause of non-compliance is the confusion between these three levels of identification. Here is a "Passport Analogy" that will help you keep them straight. According to the EU Medical Device Regulation (MDR) 2017/745, in Article 2(15) and Annex VI, Part C, the UDI System consists of multiple layers:
Layer | The Analogy | What is it? | Where does it live? |
|---|---|---|---|
Basic UDI-DI | The "Family Name" | Identifies the group of devices with the same design/purpose. | Technical Docs & EUDAMED only. (NEVER put this on the box label!) |
UDI-DI | The "ID Number" | The static ID for a specific model (e.g., Catalog #1234). | On the Label + EUDAMED |
UDI-PI | The "Timestamp" | The dynamic production data (Lot #, Serial #, Expiry). | On the Label |
Visualizing the Carrier
The "Carrier" is the barcode itself, guided by the European Commission's UDI framework.
AIDC (Auto ID): The barcode (GS1-128 or Data Matrix).
HRI (Human Readable): The text numbers below the barcode (critical in case if the scanner fails).
DPM (Direct Part Mark): A laser etched code on reusable steel instruments (more on this below).
The "Change" Decision Tree: When Do We Need A New ID?
One of the most challenging aspects of UDI is when a change calls for a new UDI-DI. Use the cheat sheet below for your next Change Control meeting. (Detailed edge cases can also be cross-referenced with MDCG Guidance documents).
Scenario A: The “Marketing” amendment.
We changed the logo on the box and the font size of the instruction manual.
Verdict: NO new UDI-DI.
Reason: The safety, performance, and identification of the device did not change.
Scenario B: The "Value Pack"
We currently sell Syringes in a box of 10. Now, we are going to introduce a “Bulk Box” of 50 syringes.
Verdict: YES, new UDI-DI.
Reason: Package quantity change means a creation of a new “trade item”, which must be different in inventory systems.
Scenario C: The Software Update
Minor Update (v1.1 to v1.2): Bug fixes, performance optimizations. New UDI-PI only (version number changes).
Major Update (v1.0 to v2.0): We introduced a new diagnostic algorithm or modified the intended use. New UDI-DI required.
The 2025/2026 Deadlines: Where Are We Now?
In November 2025, we reached the compliance deadline.
For Standard Devices:
Class III & Implantables: Past Due (2021). Full compliance required.
Class IIa / IIb: Past Due (2023). Full compliance required.
Class I (Low Risk): Deadline: May 26, 2025.
Action Item: All Class I devices (such as manual beds or basic tools) lacking UDI labeling will be considered non compliant effective immediately.
For Reusable Surgical Instruments ("The DPM Rule"):
Class IIa/IIb Reusables: Deadline: May 26, 2025.
Problem: The devices are required to have "Direct Part Marking" (laser etching). This marking should withstand hundreds of sterilization cycles.
Pitfall: It often fails due to selection of a cheap etching that wears off in 50 autoclave cycles. For Optical Devices ("The Master UDI-DI"):
For Optical Devices (The "Master UDI DI"):
Background: There are thousands of variants of contact lenses (varying diopters). It is impossible to give a unique UDI DI to each variant.
Solution: The Master UDI-DI does so.
Contact Lenses: Mandatory by Nov 9, 2026.
Spectacles/Frames: Mandatory by Sep 2028.
Team Action Plan
To stay ahead of the game, the following actions should be taken by respective departments:
R&D: Add “UDI Assessment” as a mandatory checkbox in the Design Change form.
Regulatory: Audit our Technical Files. Does every single SKU have a linked Basic UDI-DI?
IT / Operations: Make sure that our label printers are grading barcodes (ISO 15415 standards) to increase readability.
Quality: Verify that our Declaration of Conformity includes the Basic UDI-DI (mandatory).
Conclusion: Make UDI Work For You, Not Against You
UDI is not only a barcode or a mandatory check box, but an intelligent tracking system that will protect your patients, accelerate recalls, and keep your business audit ready. Whatever you change label design, launch a bulk pack, or update the software it is important to know when a new UDI is required.
How Morulaa Can Help
Morulaa HealthTech assists medical device manufacturers with UDI requirements under EU MDR 2017/745 via end to end regulatory services: Assigning compliant Basic UDI-DIs and UDI DIs via recognized issuing entity; Ensuring proper registration in EUDAMED. Our team will integrate UDI implementation into your QMS, perform labeling and packaging review, and make sure that your documentation meets EU regulatory requirements.
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