ACC is overhauling its services after feedback from 5500 New Zealanders who wanted the agency to be 'more responsive, more transparent and easier to deal with”.

So it's rolling out customer service initiatives or changing its operating.

ACC board chair Dame Paula Rebstock says this will put its customers, injured clients, health providers and levy payers, at the heart of what it does.

And to achieve that, it'll gave to inject significant investment - $456 million - to integrate its people, processes, information and technology to meet the needs of its clients.

The ACC will deliver the programme over five years.

The first stage includes service improvements for business customers, the levy payers, such as simplified levy invoices. It'll simplify and modernise systems that support those customers.

The second stage, starting in 2018, will give clients better digital access to their claim information and give both them and providers the necessary tools and information to improve rehabilitation and return to work outcomes.

Funding for the programme will come from ACC's operating budget and will not impact on levies.