You can have up to 201 parameters. See help for details.

x=5
? ICASE(x=1, "One", x=2, "Two", x=3, "Three", x=4, "Four", "Other")

>Would be better if could have more than three parameters
>
>Only way I do it is like this:
>ICASE(mstatus =1,"single",mstatus = 2,"Married",icase(...))