Eligibility for the NDIS depends on a few different things such as:
Age: You need to be under 65 years at the time of your application.
Residency: You need to be an Australian citizen, permanent resident, or a New Zealand citizen who holds a Protected Special Category Visa.
Disability: You must have a permanent disability that significantly affects how you can communicate, move, care for yourself, or manage your life.
Early Intervention: You might be eligible if early intervention would substantially improve your functioning, or delay or decrease a decline in functioning, for you or your child.
Find more information on the NDIS website.