The following reports may meet your HIPAA reporting needs:

Daily Activity Report by User

Transaction Analysis User Detail

Transaction Analysis User Summary

Transaction Detail by User

Transaction Monthly Detail by User (by Date Posted)

Transaction Summary by User (by Date Posted)

The ProviderSuite > Setup > Users screen will show you the last login date for every user on your account along with the last time their password was changed.

Also, changes to key account data on the Setup screens generate an email to the the person who made the change and to the Account Manager email address from Setup > General.