The Primary Device Identifier (DI) is the DI portion of the UDI placed on the lowest package level of a device that is required to meet UDI label requirements.  If the device is not packaged, the UDI may be on the device itself, thereby satisfying both the UDI label and the direct mark (DM) requirement if the UDI is intended to be permanent.   The primary DI is the main (primary) lookup for a medical device and meets the requirements to uniquely identify a device through its distribution and use.
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