The main difference between Social Security Disability (SSD) and Supplemental Security Income (SSI) is that SSD is available to workers who have attained a specified number of work credits, while SSI is available to those who have not worked or who have not earned enough work credits to qualify for SSD. Also, with SSD, a person’s dependents could potentially receive auxilliary benefit; however, with SSI, only the disabled individual is able to receive any benefits. SSI recipients also can receive Medicaid, while SSD recipients can receive Medicare.