https://secure.ssa.gov/apps10/poms.nsf/lnx/0200204001
https://secure.ssa.gov/apps10/poms.nsf/lnx/0200204002


Each program has a prescribed form or a different computer program that must be used to file a claim. For SSDI, the paper form SSA-16 isused or the MCS program. For SSI, the paper form SSA-8000 is used or the MSSICS program.

An SSI claim protects the filing date of an SSDI claim, but unless someone indicates an intent to file an SSI claim in their SSDI claim, the intent to file an SSI claim is not protected.

Filing for SSI is filing for public assistance. No one is forced to file for public assistance without making a decision to do so. A wealthy person who files for SSDI is not also filing for SSI without completing a prescribed application.

Each program is paid under a different section of the Social Security Act. Title II is SSDI and retirement benefits. Title XVI is Supplemental Security Income. SSDI was added as a modification to retirement Social Security, sometime in the 1950's. SSI became effective in 1974, when the federal government took over the state aid to the disabled and elderly.

You have to file for each separately. In every state in the US. But you can do it with one employee in many SSA offices. Other SSA offices separate the interviews.

Russ, the service rep at the 800# should be able to answer your question about whether or not you have an open SSI claim. Your attorney should know.