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, muscle biopsy if performed, EMG, neurologist/neuromuscular specialist records, pulmonary function tests, and functional assessments.
Common misconceptions
Duchenne MD in childhood qualifies via Compassionate Allowance. Adult-onset forms (Becker, limb-girdle, myotonic) require documented functional impairment.
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.