Gravity Forms is not fully HIPAA compliant.
Although Gravity Forms itself does not store or collect data on behalf of its users, it fails to sign a Business Associate Agreement (BAAs) with users, which is essential for HIPAA compliance.
However, if you are looking for a Gravity Forms alternative that fully complies with all of HIPAA requirements with even templates to back it up, Fill is the best alternative to Gravity Forms in this regard.