How do I become involved in SSI/SSDI cases that are already in process? What about cases that have been going on for a long time, such as those waiting for a hearing or appeal?

If the case is pending at the initial or reconsideration stage, you can become the applicant's representative via submission of the SSA-1696: Appointment of Representative form. You will then be able to communicate with SSA/DDS about the application and request access to the materials that have been submitted. After reviewing the person’s file, you'll know what needs to be addressed, just as when you are starting anew with someone. If the person isn't willing to have you be the representative, ask if they have one - if so, try to assist that person with what needs to be addressed.

If the person is waiting for an appeal hearing, it may be necessary for you to secure legal representation for them through agencies such as the state Protection and Advocacy organization, Legal Services, Legal Aid, or another kind of pro-bono legal service.

Read more at Prior or Pending Applications.