On July 30, 1965, President Lyndon B. Johnson signed the Medicare and Medicaid Act, also known as the Social Security Amendments of 1965, into law. It established Medicare, a health insurance program for the elderly, and Medicaid, a health insurance program for people with limited income.
Hope this helps, the link is done below. (Not taking credit, those are not my words)
https://www.archives.gov/milestone-documents/medicare-and-medicaid-act
