UDI Milestone: Unique Identifiers Now Required For Class III Devices – But Are Some Firms Lagging Behind?-thegraysheet: FDA’s Unique Device Identification system finally passed arguably one of its most important milestones on Wednesday: Makers of high-risk medical devices are now required to add distinctive barcodes to product labels. Manufacturers were also expected to enter product identifiers into a global UDI database by FDA’s Sept. 24 compliance deadline – a task that some firms are still struggling to complete, industry insiders say.