The Social Security Administration's (SSA) administrative appeals operation, under the Office of Disability Adjudication and Review (ODAR) is one of the largest administrative judicial systems in the world. SSA issues more than half a million hearing and appeal dispositions each year. Administrative law judges (ALJ) conduct hearings and issue decisions. The Appeals Council considers appeals from hearing decisions, and acts as the final level of administrative review for the agency.

http://ssa.gov/appeals/