People with disability will soon discover whether the states and territories back major changes to how their supports are calculated.
The federal government wants to introduce independent assessments for all National Disability Insurance Scheme (NDIS) participants and new applicants.
NDIS Minister Linda Reynolds will seek in-principle support from her state and territory counterparts at a meeting this Friday.
The changes are designed to rein in the annual cost of the NDIS, which is projected to reach $60 billion by the end of the decade.
Senator Reynolds argues the cost-cutting measure will also make the NDIS more fair and equitable.
But the proposed changes are strongly opposed by Labor, the Greens and disability community members.
Under the changes, independent assessments would determine participants' eligibility for the scheme, and the level of support and funding they receive.
Greens senator Jordon Steele-John has accused the government of trying to undermine the NDIS and make it more difficult to receive support.
Senator Steele-John cast doubt over the cost projections, calculated by an actuary at the NDIS, and called for the figures to be independently analysed.
"Every time another roadblock is put up to these changes and disabled people speak out about how bad they will be, the government just seems to increase the figure," he told ABC radio on Tuesday.
"It's a scare campaign to get the cross bench and disability ministers to support these changes.
"We are really hoping, as disabled people, that these ministers on Friday do not fall for it."
Senator Steele-John, who lives with cerebral palsy, urged the disability community to continue fighting the changes.
He described the upcoming disability ministers' meeting as the first in a series of hurdles the Commonwealth would need to clear if it wanted to implement the changes in August as planned.
The Australian Lawyers Alliance (ALA) called for state and territory ministers to oppose proposed changes that would mandate independent assessments, saying they would "cause irreparable damage to the individual and personal nature of the NDIS".
National ALA president Graham Droppert said in a statement that the changes would see many people with disability unable to receive the support they needed.
"We have written to each state and territory minister for disability services explaining our concerns and urging them to oppose the planned independent assessments when they meet this Friday," Mr Droppert said in the statement on Tuesday.
Senator Reynoldsbeing raised about independent assessments, but said she remained committed to introducing them in some form.
“I don't think any of them [the concerns] are insurmountable to address and there are real ways that we can make changes,” she told a parliamentary inquiry in May.
“But from my perspective, that will only occur if we can find a way to work together.”
With reporting by SBS News.
