Participants in the National Disability Insurance Scheme will again be able to use their core funding to pay for transport if their transport funding has ran out, after an administrative decision originally made in July was reversed.

"This change will give participants more autonomy in their plans, and greater choice and control over the services and supports they need," Government Services Minister Stuart Robert said.

"Participants now have a fair and consistent process to cover their transport costs with providers."

Mr Robert said the announcement was part of "considered changes" made to the scheme's rollout, but didn't say why the decision was made to restrict the funding last year.

Canberra woman Sarah Mamalai said she was relieved and delighted to hear about the decision.

"I guess I'm free again," Ms Mamalai said.

"Transport is the biggest thing for me, I use it to get to my appointments and volunteering."

The activist and mum said the NDIS had given her freedom, after three brain surgeries for cancer had left her with mobility and other issues.

"This means [the NDIS] is back to where it was when I was enjoying it.

"Because it's all about freedom and disabled people wanting the freedom to call a service provider and say 'can you take me to the GP?' and not have to worry about an inbox full of bills when there's funding in your package."

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Disability advocate Grieg Chapman from ACT Disability Aged Carer Advocacy Service also welcomed the change, but said the autonomy over transport decisions should never have been taken away from people with disabilities.

Mr Chapman is concerned about what will happen with NDIS participants who now have debts with service providers over transport needs from the last seven months.

"This whole set up should have been thought about before we got into this situation where people got into debt," he said

"There needs to be a lot more exposure and transparency and consultation with people with disabilities with these moves that they make."

It is unclear what will happen for people who have debts because of the decision, but Mr Robert said in a statement NDIS participants who had already been found eligible for transport support won't need to change their plans to take advantage of Monday's announcement.