Add Text to an Index/Match Result?

I need to add "text" to the beginning of an IF(Index/Match) result. Is there a way to do this?

This is my current IF(Index/Match) formula:

=IF(B20="","",INDEX('Depts & Codes'!$D$20:$D$33,MATCH(B20,'Depts & Codes'!$B$20:$B$33,0)))

If the result of this formula is (let's say) 20 - I would like it to display as "Cost Code 20" (without the quotations) on my spreadsheet, but if the result is blank/nothing, I want the cell to be blank.

I can easily achieve this by having "Code Code" in the cell immediately preceding the result cell ... BUT, I am totaling my columns (which include the rows that this formula exists) and thus the result is included in my totals (which it shouldn't).

Any suggestions? Thanks so much!

P.S. I can also achieve my desired result by adding "Cost Code" before the "Index" result in my 'Depts & Codes' list, but would prefer to not have to do this.

if(b20="","","Cost Code "& formula...)