The HIPAA 5010 Support KB Article 973415 explains the new ability within BizTalk to support the next version of HIPAA standards for EDI data interchange.
Note: as noted in the Applies To section at the bottom of the article, this only works with BizTalk 2009, sorry BizTalk 2006 R2 users, looks like you will be migrating to 2009 sooner than you thought.