Medical device coding should be done at the minimum sales unit of the product and above. For example, packaged passive medical device products, active medical device products containing assembleable or replaceable parts, and in vitro diagnostic reagent products containing multiple components such as calibrators or quality control products should be placed in the smallest packaging unit of the product or the smallest use unit of the product. Encode the code above. When using the unique identification of medical devices, logistics codes or internal product traceability codes can be used at the same time, but they should be noted and distinguished.