Bringing a medical device to the U.S. market involves more than determining its FDA classification and regulatory pathway. Manufacturers must also determine whether the device is subject to the FDA’s Unique Device Identification (UDI) requirements.
The UDI system was established by the U.S. Food and Drug Administration to improve the identification and traceability of medical devices throughout distribution and use. In general, medical devices subject to the UDI requirements must carry a unique identifier on their labels and packages, and information about the device must be submitted to the FDA’s Global Unique Device Identification Database, or GUDID.
1. What Is a UDI?
A UDI is a unique numeric or alphanumeric code used to identify a medical device.
A UDI generally contains two components:
Device Identifier (DI):
The fixed portion of the UDI that identifies the labeler and the specific version or model of the device.
Production Identifier (PI):
The variable portion that may identify production information such as:
- lot or batch number;
- serial number;
- expiration date;
- manufacturing date; or
- certain other production information when applicable.
The UDI normally appears in both plain-text form and a machine-readable Automatic Identification and Data Capture (AIDC) format, such as a barcode.
2. Which Medical Devices Need a UDI?
As a general rule, a device subject to the FDA UDI requirements must have a UDI on its label and device packages, unless an applicable exception or FDA-authorized alternative exists.
UDI requirements have been implemented progressively according to device risk and type.
Manufacturers should therefore evaluate several factors, including:
- FDA device classification;
- whether the product is Class I, II, III, or unclassified;
- whether an exception applies;
- whether the device is implantable, life-supporting, or life-sustaining;
- whether the device is reusable and reprocessed;
- the packaging configuration; and
- applicable FDA compliance policies.
It is important not to assume that a low-risk device automatically requires—or is automatically exempt from—UDI requirements. The specific regulatory status of the product should be evaluated.
3. Does Class I Mean No UDI?
Not necessarily.
Many Class I and unclassified devices are subject to UDI requirements. However, FDA regulations also establish specific exceptions.
One important example is the exception for certain Class I devices that are exempt from Current Good Manufacturing Practice requirements under 21 CFR 801.30(a)(2). FDA also maintains specific compliance policies affecting certain Class I and unclassified products.
Because of these exceptions and policies, determining UDI applicability requires more than simply knowing that a product is Class I.
4. What Is Direct Marking?
Some devices require more than a UDI on the package.
If a device must bear a UDI and is intended to be:
used more than once, and
reprocessed before each use,
the UDI generally must also be permanently marked directly on the device itself.
This is known as UDI direct marking.
This requirement can be particularly relevant to reusable surgical instruments, reusable medical equipment, and other devices designed to remain in service through multiple processing cycles.
Specific exceptions and compliance policies can apply, so direct-marking requirements should be evaluated separately from standard label requirements.
5. What Is GUDID?
Having a UDI printed on the product is only part of the process.
Device labelers subject to the requirement generally must also submit device information to the FDA-administered Global Unique Device Identification Database (GUDID).
GUDID contains the Device Identifier (DI) and associated information describing the device. Production Identifier information such as individual serial numbers or lot numbers is not stored in GUDID.
Before submitting information, the labeler must establish the appropriate GUDID account and ensure that the device data are consistent with its labeling and regulatory information.
6. Who Creates the UDI?
Manufacturers do not simply create an arbitrary barcode or identification number.
FDA requires device labelers to develop UDIs using the system of an FDA-accredited issuing agency.
The issuing agency provides the identification structure, while the manufacturer or other responsible labeler remains responsible for properly assigning and managing the UDI for its devices.
This means UDI implementation should be planned as part of the manufacturer’s regulatory and labeling strategy—not treated merely as a graphic-design change to the label.
7. Are There Exceptions?
Yes.
The FDA regulations establish several UDI exceptions, and FDA may also grant specific exceptions or alternatives under certain circumstances.
For this reason, manufacturers should avoid two common assumptions:
“Every medical device needs a UDI.”
and
“Our device is low risk, so UDI does not apply.”
Neither statement is sufficiently precise.
UDI applicability should be evaluated based on the device classification, intended use, labeling configuration, regulatory status, applicable exceptions, and current FDA policies.
8. Why UDI Should Be Considered Early
UDI planning should begin before the final device label is approved.
Waiting until the end of a U.S. market-entry project can lead to unnecessary changes to:
- labeling artwork;
- packaging;
- barcode configuration;
- product master data;
- quality-system procedures;
- GUDID records; and
- internal traceability processes.
For companies preparing to enter the U.S. market, UDI should therefore be considered together with FDA classification, establishment registration, device listing, labeling, quality-system requirements, and the applicable premarket pathway.
Final Considerations
For many medical devices sold in the United States, UDI is an important part of FDA regulatory compliance.
However, the correct question is not simply:
“Does my medical device need a barcode?”
The better questions are:
Does the FDA UDI Rule apply to this device? What identifier is required? At which packaging levels? Is direct marking required? Does an exception apply? And what information must be submitted to GUDID?
Answering these questions early can prevent labeling changes, database inconsistencies, and delays when bringing a medical device to the U.S. market.