SBCERA Members* do not participate in Social Security. In other
  words, your earnings from your SBCERA-covered employment are not
  covered under Social Security. 
  However, most SBCERA Members do participate in Medicare.  Medicare is our
  country’s health insurance program for people age 65 or
  older.  You should apply even if you do not intend to retire
  yet.
  For coverage information about Social Security Retirement
  Benefits or Medicare, SBCERA recommends you contact your
  employer’s Human Resources/Benefits Department or
  visit www.SSA.gov. You can
  apply for Social Security and Medicare benefits on the Social
  Security website.
  *Law Library employees do participate in Social Security.