What UDI is
Unique Device Identification is a system, defined by medical device regulators, for assigning a standardized, machine-readable identifier to medical devices, so that a specific device can be identified consistently across manufacturers, distributors, healthcare providers, and regulatory databases.
It exists to make device identification consistent where it previously was not: before UDI systems, a hospital tracking recalls, adverse events, or device usage had to work with whatever identifier scheme each manufacturer happened to use, which made cross-manufacturer tracking and recall response far harder than it needed to be.
UDI requirements are set by regulatory bodies (in the US, the FDA; in the EU, under the Medical Device Regulation; and other bodies in other jurisdictions), and the specific requirements, formats, and timelines vary by regulator and device classification. Confirming what applies to a specific device is a regulatory question, not a general inventory one.
The two-part structure: DI and PI
A UDI is generally made up of two components. The Device Identifier (DI) is a fixed code specific to a device model or version and the labeler (manufacturer) that produced it — it does not change from unit to unit of the same model.
The Production Identifier (PI) is variable data specific to the individual unit or production batch: this commonly includes the lot or batch number, the serial number (for individually identified devices), the manufacture date, and the expiration date, depending on the device type and applicable requirements.
Together, DI plus PI identifies both what the device is and which specific unit or batch of it this particular device belongs to, which is what makes device-level traceability, recall response, and adverse-event reporting possible.
How UDI relates to general inventory identifiers
The underlying logic of a UDI is the same identification structure used in general inventory management, just under a specific, regulated framework. The Device Identifier plays a role conceptually similar to a SKU: it identifies the product model, shared across every unit of that model. The Production Identifier plays a role similar to a lot number or serial number: it identifies the specific batch or unit.
A business tracking medical devices in general inventory software still needs the same underlying data, a product identifier and a batch/serial identifier, whether or not it is separately meeting a specific UDI regulatory submission requirement. Good batch and serial tracking in an inventory system is the operational foundation UDI compliance is built on top of, not a substitute for confirming the actual regulatory requirement with the applicable authority.
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