Is OwnCloud HIPAA compliant?
According to http://www.onlinetech.com/resources/references/what-is-hipaa-compliance it depends on the setup.
If you host it on-site, use a safe https configuration, offsite backups, logging/auditing, listen to ownCloud file integrity warnings, and also implement some physical safeguards (like a lock at the server room door), it seems to be compliant.
I am neither a lawyer nor a US citizen though.