Unique Device Identification (UDI) for medical devices is a series of numbers, letters or characters created by globally recognised device identification and coding standards, which includes Device Identification (DI) and Production Identification (PI), used to uniquely identify a medical device, and is regarded as a unique ‘identity card’ for medical device products in the supply chain. UDI is regarded as the only ‘identity card’ for medical device products in the supply chain.