CMS has published their updated RUG rates as of 10/1/2010.  These include 66 RUG categories, instead of the previous 53. The RUG rates depend upon whether your SNF is urban or rural, and the wage index of your area. The number of days per RUG category in input onto Worksheet S-7 of the SNF Medicare cost report.

The RUG rates can be found here.