Final answer:
Instead of NDC numbers, medical devices use the Unique Device Identification (UDI) system for identification and registration, which includes a device identifier and a production identifier.
Step-by-step explanation:
Medical devices, unlike medications, do not have National Drug Codes (NDC) numbers. Instead, medical devices are identified and registered using a system called the Unique Device Identification (UDI) system. This system was put into place by the Food and Drug Administration (FDA) to adequately identify medical devices through their distribution and use. Each UDI is a unique numeric or alphanumeric code that consists of two parts: a device identifier (DI), which is the mandatory, fixed portion of the UDI that identifies the labeler and the specific version or model of the device, and a production identifier (PI), which is the conditional, variable portion of the UDI that includes the current production information for the device, such as the lot or batch number, the serial number, and expiration date.