Any developer who has worked with HIPAA compliancy knows that the law is murky at best and the fed doesn't publish a programmers' guide to make your life any easier. However, one of the cardinal rules is the requirement to keep track of who sees HIPAA data, who modifies it and when this was done. Another is that if you delete/update patient data you need to log what was deleted/updated in order to provide an audit trail, if only for the lawyers. Failure to do so can subject a company to some pretty draconian penalties.
This creates a challenge on the database side because SQL UPDATE obliterates a record's history. There are a few potential solutions, such as maintaining a changelog which such updates are written based on table triggers. I've done this but the log of atomic changes can grow immense. It's also difficult to reconstruct a large record based on potentially dozens or even hundreds of changes to records which must be retained for up to six years. That's how a traditional RCS would handle rollbacks but it's not practical inside the confines of a database.