The Social Security and Supplemental Security Income (SSI) disability programs are Federal programs that provide assistance to people with disabilities.  While these two programs are different in many ways, the Social Security Administration administers both and only individuals who have a disability and meet medical criteria may qualify for benefits under either program. 

SSI is a federal program that provides monthly cash payments to people in need.  SSI is for people who are 65 or older, as well as for blind or disabled people of any age, including children. 

Supplemental Security Income (SSI)

U.S. Social Security Administration

Medicaid 

Medicaid Waiver - A Family Guide to Medicaid Waiver Services (pdf)