What you have to prove
Show one of: (A) disorganization of motor function in two extremities with extreme limitation; OR (B) marked limitation in physical functioning AND marked limitation in one area of mental functioning.
Medical evidence SSA expects
Genetic testing where applicable (Huntington's), neurology records, neuropsychological testing, and imaging.
Common misconceptions
Many of these conditions qualify via Compassionate Allowance at diagnosis. Early disease with mild symptoms may not meet the listing until progression.
Didn't meet the listing? You can still qualify via a Medical-Vocational
Allowance — SSA's determination that your residual functional capacity, combined with
your age, education, and work history, leaves no jobs you can do. See our
appeals guide for what to do after an initial denial.