The Accident Compensation Corporation says it's taking significant steps to improve its privacy following a series of serious security lapses.
Investigations are underway into breaches involving the information of thousands of clients being mistakenly sent to another client.
In a separate incidents, levy notices of more than 100 business clients were sent to the wrong person and ACC files, being carried by a doctor travelling on a bus, went missing when a bag was stolen or taken by mistake.
ACC chief executive Ralph Stewart told TVNZ's Q+A programme the corporation is taking the privacy breaches immensely seriously.
He says it has commissioned KPMG to carry out an independent report into the matter, which will be completed by June and released to the public.
A separate commission will look at ACC's infrastructure to see how it can be improved.
Mr Stewart said ACC has commissioned 80 privacy champions throughout its network to constantly monitor, maintain and raise awareness for privacy.