An inquest into the death of a man whose decomposed body was found two months after his disability funding was cut off is yet to find out why.
But the case has led to change at the agency responsible for the National Disability Insurance Scheme.
An autopsy failed to establish the cause of the death of David Harris at his home in western Sydney in 2019.
Mr Harris lived with a psychiatric condition and diabetes, and his funding stopped after he missed an annual review with the National Disability Insurance Agency.
"Did it not occur to anyone to phone when he missed a meeting?" Labor senator Kimberley Kitching asked the agency at a Senate estimates hearing on Friday.
"He was dead for two months before anyone found him."
An inquest was announced in December 2020 after a public campaign about his death.
"Obviously it's not just Mr Harris who has perhaps died in a way that was unnecessary and in a totally undignified way, with no care," Senator Kitching said.
Ann Marie Smith, who was under the care of the NDIS, died in Adelaide last year from profound neglect.
"That's why I'm asking these questions because there should not be a single person, let alone more than one," she said.
NDIA chief executive Martin Hoffman said the inquest "hasn't commenced in any significant way" but the agency has not waited.
He said the agency has done a detailed internal review of the circumstances that led to changes in approach to the ending of plans and the continuation of plans, and profiling vulnerability.
"It led to and has contributed to changes we have made around our check-in process with participants," he said.
Disability Minister Linda Reynolds said the agency did not have a public guardian role.
The NSW coroner will conduct the inquest.
