Worked…

Here is my NRPE Output:

####NRPE Command####
# /usr/local/nagios/libexec/check_disk -w 80 -c 90 -d /dev/cciss/c0d0p1

OK – /dev/cciss/c0d0p1 space used=79% | ‘/dev/cciss/c0d0p1 usage’=79%;80;90;

###NRPE Config in /usr/local/nagios/etc/nrpe.cfg file###

command[check_root]=/usr/local/nagios/libexec/check_disk -w 80 -c 90 -d /dev/cciss/c0d0p1

###NAGIOS SERVER CONFIG###
define service{
use generic-service
host_name test.example.local
service_description ROOT Partition
check_command check_nrpe!check_root
check_interval 15
retry_interval 1
}