The implementation of the revised ABN form was to be September 1, 2008. It has been noted on the ABN page of the CMS website that the deadline has been revised to March 1, 2009.
CMS's website states,
"Beginning Monday, March 3, 2008, providers (including independent laboratories), physicians, practitioners, and suppliers may use the revised ABN for all situations where Medicare payment is expected to be denied. The revised ABN replaces the existing ABN-G (Form CMS-R-131G), ABN-L (Form CMS-R-131L), and NEMB (Form CMS-20007). Beginning March 1, 2009, the ABN-G and ABN-L will no longer be valid."