I think it really depends on the employer, practice and type of environment or coding you would be doing. Everyone should have a basic understanding. In my current auditing role excel and word are heavily used however, as a production coder it would not really have been needed in other places I have worked.
Some places might be heavy in excel use while others use their internal EMR/EHR for data entry, etc.
I would not expect an entry level coder to be highly proficient in those realms. I would be more concerned with their coding knowledge, ability to learn and research to find answers to coding issues. Who cares if you are really adept at excel if you can't find a correct ICD-10 code or CPT for a procedure?