The first digit of UPC, is called number system (NS) code.
|NS = 0,6,7||code for source marking of foods and sundries, administered by UCC.
For the product exported to U.S. must have its own UPC maker code in this NS, and to besource marked.
|NS = 2||NON-PLU attached to instore marking like measured-out products, etc.|
|NS = 3||Administered by FDA (Food and Drug Administration). Used for NCD (National Drug Code) and HIR (Health Related Item Code).|
|NS = 4||For instore codes attached to sundries which cannot be source marked.|
|NS = 5||This is used for coupons.|