A "business control team", chaired by Health Department secretary Alice Burchill, and a "business process redesign team", led by a KPMG expert, must find $100 million in savings in the health budget for 2011-12.

Only $27 million has been identified since the extent of the state's financial woes became apparent in February.

Budgets for each of the state's hospitals will be finalised next month, giving a clearer picture of where the remaining savings will be made.

About $520 million has been wiped from the health budget over four years.

Opposition health spokesman Jeremy Rockliff led the attack on Health Minister Michelle O'Byrne during the second day of budget estimates hearings yesterday.

He accused her of wasting taxpayers' money on the "razor gangs".

The minister's spokesman later defended the teams as an investment to find half a billion dollars worth of savings over four years.

"Is the opposition suggesting the government make savings without systematically considering how to do so?" the spokesman said.

Ms O'Byrne promised patient services and care would not be impacted by the cuts.

She encouraged all staff to consider how services could be delivered more efficiently.

Each "working group" has been given a target to shave 5 per cent off their budget, but Ms O'Byrne said this was only a guide.

"There may be some areas that find more than 5 per cent and some that find less than 5 per cent."

She said no target had been set for the number of redundancies required to generate savings.