I assume by "SS" you mean "SSI" or "Supplemental Security Income" benefits. The only way you could switch from SSI to SSDI would be if you somehow able to get two (2) additional quarters to qualify you for SSDI. If you have been on SSI and have not worked at all, you would not have gained any quarters to get you up to 40. If, after you were awarded SSI, you started working again, which would have made you ineligible for SSI, then it is possible to get SSDI if you worked enough and your disability began again, which is what qualified you for SSI to begin with.
Answered on Sep 25th, 2012 at 11:46 PM