However, as of my knowledge cut-off date in September 2021, there were no new updates regarding six COVID-19 related vaccine codes or any new appendix related to the COVID-19 vaccine.
It is best to check with authoritative sources like the Centers for Disease Control and Prevention (CDC) or the World Health Organization (WHO) for the latest updates on COVID-19 vaccines and related codes. These organizations typically release updates regularly and can provide accurate and up-to-date information.