Codes on Imported Foods from Japan

I heard that food imported from Japan has a specific code on its food label to indicate its origin, is this true?

There is information circulating on the Internet that imported foods from Japan may be labelled as originating from Tokyo, but have codes in front of the expiration date indicating that the origin of the food is actually from Fukushima, Gunma, Chiba, Ibaraki or other regions. This rumor has circulated a few years ago, but there is no evidence to support it. The Centre for Food Safety has checked with the relevant government department of Japan and confirmed that the codes have no relation to the foods' origin. The Government of Hong Kong SAR will closely monitor the latest situation of imported food from Japan and the discharge of wastewater from the Fukushima nuclear power plant, and assess the related risks to take appropriate corresponding measures.