Re coding many variable simultaneously

Hiii All,
I am using a datasheet which have many categorical variables like v1, v2 , v3, v4, v5 .............v60 with values (0 , 1 , 8, 9) only and also have a variable named "stage of disease" (having 3 categories: mild, moderate and severe) ....
Here i want to replace all the values from v1 to v20 =9 (here 9 means not applicable) if "stage of disease" is mild.
It would me most helpful if anyone help me doing so.... as it is so time taking to type replace function too many time.

thanks in advance...