You cannot get mutations into your genetic code, since the genetic code is exactly that, a code, which is universaj. There's just one genetic code that is shared by all living organisms, with very few small exceptions.
Mutations occur in genes, which are made of DNA. The genome is the collection of all genes and other DNA sequences, and it's the sequence of the genome what is specific of an individual. An individual or a cell has no genetic code.
https://fountain.fm/episode/dNwNbdvnlEXIzc03OwIO