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The atc/ddd system is a yearly publication. In 2008-01 a new version was published at http://www.whocc.no/atcddd. They also publish yearly lists with changes and new codes with regard to the previous version.
The 2009 updates are now included, as well as the ATCvet codes (except for ATCvet code QI02 to ATCvet code QI20 now included. ἀνυπόδητος (talk) 19:46, 16 July 2009 (UTC)). Some of the older 5th level additions (2007, 2008) might still be missing, though. --ἀνυπόδητος (talk) 12:51, 22 June 2009 (UTC)