Nope, the are the suggested specializations...
I don't find any reference that specializations in the book just act as
examples or
suggestions.
Sure, some specializations have suggestions (like Hardware -Commlinks, -Cyberdecks, -Smartguns
etc.).
But most have a definite list (like Medicine -Cosmetic Surgery, -Extended Care, -Implant Surgery, -Magical Health, -Organ Culture, -Trauma Surgery).
Fleshing out your character with knowledge about preventative medicine, dietary medicine and Basic A Programming would be separate [in this case Academic or Professional]
Knowledge skills.
Sure - you can also invent new specializations to active skills (or even invent new active skills, change the behavior or scope of existing skills and make up your own skill groups),
...but that would require GM Approval / GM House Ruling; wouldn't it....?
I feel like I am out on thin ice here -it sound as if i am- but that is part why i am asking;
i might simply have missed the reference that make listed skills and listed specializations into just suggestions...