Government Services Minister Stuart Robert has previously said only a"small cohort"of people will be affected by the reviews,but Services Australia data provided to the Senate suggests at least 220,000 cases stand to be re-examined.
On Thursday,in the wake of the federal court development,Mr Robert did not respond to questions about how many people the government will now need to contact and what the time frame is for doing so.
"My message to Australians is that my department will work through this sensibly and practically and will be in contact with Australians from this limited group who may have been impacted,"he told Parliament.
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Mr Robert also did not respond to questions about whether the government will need to include its robo-debt liability in next month's mid-year budget update.
Labor's government services spokesperson,Bill Shorten told Parliament"every day the government doesn't fix the matter,you're probably costing interest payments to the taxpayer another $100,000 a day".
He also toldThe Sydney Morning Herald andThe Age,"legal actions afoot could see the government forced to repay hundreds of millions of dollars".