Early-onset Alzheimer's Disease is just one of several hundred conditions that the Social Security Administration includes in its "Compassionate Allowances" list. If an applicant for Social Security Disability Insurance (SSDI) or Supplemental Security Income (SSI) suffers from one of the conditions on this list, the Social Security Administration says it will process the application in weeks, not the months or even years a typical application may require. Obviously it can be enormously helpful to the applicant, the family and caregivers to get funds sooner rather than later.
Social Security Disability Insurance (SSDI) is designed to assist those who have paid into the Social Security Trust Fund during their working lives. Supplemental Security Income (SSI) is for those age 65 or older, or blind or disabled persons of any age who have limited income and resources.
Recently the Social Security Administration expanded its Compassionate Allowance list to include several additional conditions. For a full list, check out the SSA website.