Looking around more I found the agenda for the begining of next year that has the latest codes
http://www.cms.hhs.gov/paymentsystem...ddendafy05.pdf
It looks like they are changing the codes from a code for just removing the old disk to a whole new code for artifical disks. It looks like the code they used to use 80.51 (remove old disk) is being replaced by codes 84.60 to 84.69 (implant/revise artifical disk).