Attempts to reduce the annual cost of the $56 billion National Disability Insurance Scheme will seek to move 160,000 people onto other yet-to-be-built supports run by states and territories.
As the final day of a senate inquiry into the changes gets under way, NDIS Minister Mark Butler dismissed calls for an extension to the hearings following concern from disability groups.
He said the changes were on track to pass parliament by the beginning of July.
"We're confident that the timeline that we've set out, the need to get this bill through the parliament as quickly as possible before the winter break, is the right plan," he told reporters in Sydney on Thursday.
"There have been thousands of submissions made. There are a number of days of public hearing, people are being given the opportunity to make submissions about the bill."
One of the architects of the NDIS warns plans to force participants to have their impairments reassessed before getting ongoing support is disruptive and unnecessary.
The head of disability provider Aruma said adjustments were needed to avoid putting unnecessary strain on disabled Australians.
Aruma chief executive Martin Laverty helped design the NDIS and was an inaugural director of the National Disability Insurance Agency.
The provider said it broadly supported the changes but the reassessment was unnecessary, particularly for those with lifelong disability, children in out-of-home care and people receiving supported independent living.
"For all three cohorts, subjecting participants to a comprehensive functional capacity assessment serves no purpose. Their disability is established, permanent and not in dispute," Aruma's submission to the inquiry states.
"For (people with a lifelong disability living in the community), a full functional capacity reassessment is clinically unnecessary and potentially harmful."
The company also raised concerns about sweeping powers which allow the minister responsible for the scheme to set funding and staffing levels for specific supports under the NDIS, while reducing participants' rights to appeal.
Aruma is among a number of providers, advocacy groups and government agencies scheduled to give evidence on the final day of the inquiry.
Mr Butler said the government would not be providing commentary on the submissions.
"We're watching it closely, we're studying the submissions that are being made, and once the inquiry delivers its report, will obviously be in a position to consider our response," he said.
"(The overhaul) will ensure that we start down the path of getting this enormously important scheme back on track, while also obviously considering the views of the disability community."
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