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You may be interested in the Direct project, a set of open standards for secure communication between different healthcare systems: http://wiki.directproject.org/Main_Page

The DebianMed team might have packaged something useful:

https://wiki.debian.org/DebianMed https://blends.debian.org/med/tasks/

That's a file system and platform. See Databrick's recent work in EHR. It's open source.