IIF In SSRS With Opposite Of = For A List

I am trying to build a Expression using IIF with the opposite of this in a calculated field:

=IIF((Fields!DEPARTMENT_CODE.Value = "22700") OR (Fields!DEPARTMENT_CODE.Value = "22800") OR (Fields!DEPARTMENT_CODE.Value = "22900") OR (Fields!DEPARTMENT_CODE.Value = "23000") OR (Fields!DEPARTMENT_CODE.Value = "2350") OR (Fields!DEPARTMENT_CODE.Value = "23800") OR (Fields!DEPARTMENT_CODE.Value = "23900") OR (Fields!DEPARTMENT_CODE.Value = "24000") OR (Fields!DEPARTMENT_CODE.Value = "24100") OR (Fields!DEPARTMENT_CODE.Value = "24200") OR (Fields!DEPARTMENT_CODE.Value = "24300"),1,0)

I have tried <>, AND, AND NOT, and XOR which all seem to yield the same results.  Any suggestions would be greatly appreciated!

Thanks in advance! Brett