If you want to find out the reason for the code change, you can log in to the "Remaining Affairs Office" and open the health code. The source information of the code is displayed below the health code, prompting "XX city, X month, X number push".
Transcoding of health codes can be registered in "Shi Yu Office", and transcoding materials can be submitted online as required. Transcoding applications will be distributed to the coding unit for background verification, and those that meet the transcoding conditions will be transcoded by the coding unit. You can also contact the epidemic prevention and control headquarters in the coding area to consult about transcoding.