Eligibility for SSD or SSDI

Social Security uses both medical disability criteria  and non-medical criteria to determine whether you qualify for Social Security disability (SSDI, the program based on work credits) or Supplemental Security Income (SSI, the low-income program).  First, you must be able to prove that you are medically disabled. Second,  you must have either earned enough work credits to be considered "insured" under the SSDI program or your income and assets must be low enough to qualify for the SSI program.