Author. The health certificate number shall be filled in by the staff. The number is 4 digits, and the health certificate number is 12 digits. The first eight digits are the year and date, and the last four digits are numbers. No, everyone's health certificate is not only coded differently, but also the previous date, so it will never be repeated. In many cases, we may apply for a health certificate. There will be a number after the general health certificate is processed, so how should I check the number of the health certificate? The health certificate number is 4 digits, which shall be filled in by the staff.