Disability groups are demanding assurances that National Disability Insurance Scheme funding is secure and fully covered into the future, after it emerged $3.9 billion originally promised to the scheme will be redirected to fund drought relief.

The federal government’s $5 billion Drought Future Fund, announced on Friday, will be partly funded through the Building Australia Fund (BAF) – despite this money previously being earmarked for the NDIS.

Disability groups are seeking clarity from the government around future funding for the scheme.