You don't need the social security administration to have accepted that you are disabled, generally a doctor's certification that you are unable to perform gainful work will be enough.
The IRS definition of disabled is that you are unable to perform substantial gainful work, due to a condition that is permanent, or will last at least one year. Gainful work is working for money. If you can work a minimum wage job, that is usually taken a proof that you can perform gainful work, even if it is not the job you would prefer. This means that some people with a medical disability are not disabled for tax purposes because they can still work.
