The reentitlement period is a safety net for Title II disability recipients who return to work. The reentitlement period begins at the end of the 9-month trial work period, and lasts for 36 months.
If you cannot continue working at the SGA level due to your disabling impairments during the 36-month rentitlement period, you do not have to go through the disability application process all over again. Rather, you just notify Social Security that you are unable to work, and they will restart your disability benefits right away. This safety net is intended to encourage you to test your ability to work.
There is no trial work or reentitlement period for SSI beneficiaries.