WPC has released Open Source schemas representing the HIPAA transaction sets. Representing HIPAA EDI data in XML just became much easier. WPC, publisher of Electronic Data Interchange (EDI) transaction implementation guides adopted under HIPAA, is pleased to announce the release of W3C complaint XSD, Open Source Schemas, under the GNU license. Created directly from the same database as the federally mandated implementation guides, WPC schemas provide a single source for an XML representation of the HIPAA transaction standards.

You can find more information and downloads here.