From a recent report by Social Security's Office of Inspector General:
We randomly sampled 275 cases from about 190,900 that ALJs [Administrative Law Judges] initially denied in FY [Fiscal Year] 2011. At the time of our review, 79 claimants (29 percent) were receiving benefits, and another 36 (13 percent) were still awaiting a decision on a new application or appeal for disability benefits. Seventy-five claimants (27 percent) reported earnings in Calendar Year 2011 or later, of which about half reported annual earnings between $12,400 and $66,700. In general, these earnings exceeded a threshold used by SSA [Social Security Administration] to determine eligibility for disability benefits. Another 63 claimants (23 percent) were not receiving Agency benefits or reporting earnings. However, some in this category had unsuccessfully appealed or reapplied. The final 22 claimants (8 percent) either were deceased or had unique situations, such as Medicare-only benefits, incomplete records in SSA systems, or children receiving benefits because of a parent’s status.