The National Disability Insurance Scheme could owe service providers up to $300 million.
Anne Bryce, vice president of National Disability Services and CEO of Achieve Australia, says NDIS could owe New South Wales $120 million alone, and nationally up to three hundred million dollars.
Bryce said hundreds of organizations are owed significant amounts of money.
A spokesperson for the organization that manages NDIS acknowledged some providers were owed money, ensuring there were several reasons that payments could be delayed.