Social Security Disability Benefits are for a Substantial Impairment
To qualify for disability benefits from Social Security, you must have either a physical or mental impairment that is expected to keep you from doing any substantial work for at least a year or be suffering from a condition that is expected to result in your death.
If you become disabled, you should file for disability benefits as soon as possible. You can do this by calling or visiting any Social Security office. Social Security’s disability rules are different from those of the CSRS and FERS annuity systems. So the fact that you qualify for benefits from the government does not mean that you will be eligible for Social Security.
Important note: If you are applying for a disability benefit under FERS or CSRS-Offset, you must apply for a Social Security disability benefit at the same time.