First of all, if your health code is not green, and your health code is yellow or red, it means that you may have been to high-risk areas, so you must do nucleic acid testing.
Then, if you have never been to a high-risk area, it will automatically turn yellow. If you want to complain about your health code, you should call the CDC to report the situation.
Finally, we have to do two or three nucleic acid tests and the test results are negative. After a week, your health code will turn green after being processed by the CDC.