All customer orders and subsequent communications use NPCs. NPC’s are unique product catalogue codes created by NHS Supply Chain, which are not generated or governed by suppliers or manufacturers. Our unique NPC codes eliminate processing issues that occur due to duplication across MPCs. NHS Supply Chain submits orders to a supplier using the MPC. The supplier, therefore, quotes the MPC reference on delivery and invoicing paperwork.  We have reminded our suppliers that they must include that at least one of the NPC or MPC on all paperwork.