In a nutshell Oracle has a small number of Modules that work well in the healhcare space. Of primary interest on the technology stack is a product from their Advanced Technology Group called Transaction Hub. This solution is designed to allow you to comply with complex integration needed to connect your trading community as well as transact via HIPPA compliant transaction sets and security protocols.
Oracle is also working on a technology foundation that will be used as a next generation architecture on which Healthcare ISV's can develop their clinical applications.
Hope this helps a bit.