I read somewhere that you are allowed to stay on your parents' insurance past age 26 if you are disabled. Is this true?

I turn 26 in september but won't be able to get on medicare until 2014 because I haven't been on SSDI for the 2 years. I don't get medicaid and there's no way I could afford insurance on my own, even if I could get it with my pre-existing conditions. I have a baclofen pump so I'd be SCREWED without medical. Any advice?