A review of the National Disability Insurance Scheme is under way to ensure it is operating as intended, but state governments have not confirmed whether they would be willing to increase their funding share.
Projections show the scheme will cost $8.8 billion more over the next four years, and by 2025/26 it is expected to cost as much as $50b a year.
Prime Minister Anthony Albanese said while the costs of the scheme were increasing "at an extraordinary rate" there was bipartisan support for it continuing.
"There is support across the parliament but we will look at ways ... of how it can operate effectively to ensure that the people it was designed to support get the support that they need," he told reporters in Canberra.
Social Services Minister Bill Shorten last year announced a wide-ranging review of the design and sustainability of the scheme which will also look at how it could be more responsive and supportive.
A report is set to be delivered to the government by the end of October this year.
Victorian Premier Daniel Andrews said state and federal governments had a shared interest in ensuring the scheme was viable and could continue.
Mr Andrews said he looked forward to seeing the outcomes of the NDIS review.
"We often talk about costs but we should not lose sight of the benefits of the scheme as well. This is about changing lives and saving lives," he said.
"This is not a cost. It's an investment in (Australia) being a fair place, a decent place."
