Hi

Did you try ISERROR?

=ISERROR(IF(AND(F4<>"",$F$1=H4-10,F5=0),"Notify PT",IF(AND(F4<>"",$F$1=H4-9,F5=0),"Notify PT",IF(AND(F4<>"",$F$1=H4-8,F5=0),"Notify PT",IF(AND(F4<>"",$F$1=H4-7,F5=0),"Notify PT",IF(AND(F4<>"",$F$1=H4-6,F5=0),"Notify PT",IF(AND(F4<>"",$F$1=H4-5,F5=0),"Notify PT",IF(AND(F4<>"",$F$1=H4-4,F5=0),"Notify PT",IF(AND(F4<>"",$F$1=H4-3,F5=0),"Notify PT",IF(AND(F4<>"",$F$1=H4-2,F5=0),"Notify PT",IF(AND(F4<>"",$F$1=H4-1,F5=0),"Notify PT"," "))))))))));"")