More than 1,200 Australians died over a three-year window while waiting for support through the National Disability Insurance Scheme.
Senators were told at a budget estimates hearing on Thursday that 1,279 NDIS-eligible people had died from July 2016 to September 2019.
"(They) had been assessed as eligible for the NDIS but died before receiving their first plan," head of the agency that looks after the scheme Martin Hoffman said.
There is no link suggested between the deaths and not having a plan.
National Disability Insurance Agency chief executive, Martin Hoffman. Source: AAP
It has also emerged in the Senate estimates hearing that an independent review into privacy breaches at the agency cost more than $53,000 for a two to three-week probe.
The review was prompted after it emerged Helen Nugent, chair of the disability agency, was using her private email for the role.
That email account was linked to Macquarie Bank, her former employer.
Dr Nugent continues to conduct her NDIS work from an office space at the bank's Sydney offices.
The review found there were no privacy breaches, but Mr Hoffman said he sent letters to three staff about their conduct.
"I provided to them a letter setting out expectations in terms of the way information should be handled going forward," he said.
Mr Hoffman wouldn't say if Dr Nugent was one of the three, citing privacy reasons.
There are 12 cases of fraud in the national disability support scheme being investigated by authorities.
Senior government official Scott Britton would not elaborate on the details of each case to the Senate estimates committee.
Mr Britton said another two fraud cases were before the courts, while one case had been prosecuted for more than $480,000.
It's the only fraud case that's been successfully convicted by the National Disability Insurance Scheme since its inception in 2013.
The agency which looks after the NDIS said in its latest annual report that $34.6 million had been flagged as incorrect payments.
