You are totally disabled. (The key to the disability exception seems to lie in the permanence of the condition, not the severity. Therefore, to claim this exemption you have to furnish not only information proving that you are totally disabled, but also information on the permanence of the disability.)
You have died and your beneficiary gets the money.
You have made contributions under special automatic enrollment rules that are withdrawn pursuant to your request within 90 days of enrollment.
Distributions that are qualified reservist distributions. Generally, these are distributions made to individuals that are called to active duty for at least 180 days after September 11, 2001.
Distributions made due to an IRS levy of the plan under section 6331.
This is for educational purposes only. The information provided here is intended to help you understand the general issue and does not constitute any tax, investment or legal advice. Consult your financial, tax or legal advisor regarding your own unique situation and your company's benefits representative for rules specific to your plan.