Here is an interesting paragraph from the report (footnotes omitted):
SSA [Social Security Administration] explored other options to address the effect of State furloughs, such as contracting with private companies and federalizing the State DDSs [Disability Determination Services]. However, these options would likely involve legislative changes, as the Social Security Act, in effect, requires that most disability determinations be processed by State DDSs. Additionally, SSA estimated that federalizing the State DDSs would be more costly than the current framework—costing approximately $4 billion over the first 4 years.