From the CMS website:
The latest version of the ABN (with the release date of 3/2011 printed in the lower left hand corner) is now available for immediate use and can be accessed via the link below. In order for providers and suppliers to have time to transition to using the newly posted notice, mandatory use of this version begins on January, 1 2012. All ABNs with the release date of 3/2008 that are issued on or after January 1, 2012 will be considered invalid.
