Continuing Disability Reviews are done periodically for those receiving Social Security disability benefits. The Social Security Administration initially thinks a person has medically improved sufficiently to be able to work. All children receiving SSI based on disability are re-evaluated at age 18, whether or not they have medically improved. Sometimes Social Security is correct, often it is not.
A letter from a doctor certifying that there has been no improvement is usually all that is needed to head off what can be a disastrous termination of benefits. Reviews are more likely to occur in when a person is under 50.
Continuing Disability Reviews can also be ordered by a Social Security judge who grants benefits but believes there may be improvement within a year or two. Some serious or terminal conditions are not reviewed.