You can see the Caristix Cloak tool ( http://caristix.com/products/cloak/ ).
Here is the description from the site:
Caristix Cloak deactivates protected patient data at source, in HL7 logs, and message flows. It creates audit reports after each de-identification. This is the easiest way to generate clinically valid data for interface development, testing, and analytics — and stay consistent with your HIPAA policies and procedures.
It is pretty fast and easy to use. It can use realistic data, such as fake patient names and addresses, and not just random strings. In addition, when you deactivate multiple messages, the clinical workflow remains the same as PatientX is replaced with patientY for the entire message list.
Disclaimer: I am part of the Caristix tool development team ...
jlmorin
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