Editing Universal Product Code (section)

=== Number system digit ===
Below is a description of all possible number systems with the corresponding 12-digit UPC-A numbering scheme <u>L</u>LLLLLRRRRR<u>R</u>, where <u>L</u> denotes the numbering system digit and <u>R</u> the check digit.
; 0–1, 6–9 : For most products. The LLLLL digits are the manufacturer code (assigned by local [[GS1#Standards|GS1]] organization), and the RRRRR digits are the product code.
; 2 : Reserved for local use (store/warehouse), for items sold by variable weight. Variable-weight items, such as meats, fresh fruits, or vegetables, are assigned an item number by the store, if they are packaged there. In this case, the LLLLL is the item number, and the RRRRR is either the weight or the price, with the first R determining which (0 for weight).
; 3 : Drugs by [[National Drug Code]] (NDC) number. Pharmaceuticals in the U.S. use the middle 10 digits of the UPC as their NDC number. Though usually only [[over-the-counter drug]]s are scanned at point of sale, NDC-based UPCs are used on prescription drug packages and surgical products and, in this case, are commonly called UPN Codes.<ref>{{cite web|title=Barcodes for Pharmaceuticals and Surgical Products|url=https://upcs.com/blog/universal-product-number-upn-for-medical-pharmaceutical-surgical-products/|work=UPCs.com|date=24 March 2022|access-date=28 February 2023|archive-date=28 February 2023|archive-url=https://web.archive.org/web/20230228032708/https://upcs.com/blog/universal-product-number-upn-for-medical-pharmaceutical-surgical-products/|url-status=live}}</ref>
; 4 : Reserved for local use (store/warehouse), often for [[loyalty card]]s or store coupons.
; 5 : [[Coupon]]s. The LLLLL digits are digits 2-6 of the product's UPC prefix, the next three RRR are a family code (set by manufacturer or supplied by the coupon clearing house), and the next two RR are a value code (according to the GS1 value code table), which determines the amount of the discount. These coupons can be doubled or tripled.<ref>{{cite web|title=Barcodes for Coupons|url=https://www.simplybarcodes.com/barcode-coupons.html|work=SimplyBarcodes.com|access-date=16 February 2022|archive-date=16 February 2022|archive-url=https://web.archive.org/web/20220216234837/https://www.simplybarcodes.com/barcode-coupons.html|url-status=live}}</ref>