Special Needs Trust Fairness Act of 2013 - Amends title XIX (Medicaid) of the Social Security Act with respect to the treatment of revocable trusts for the benefit of an individual for purposes of meeting income requirements for Medicaid coverage.

Extends the supplemental needs trust exemption from treatment of a trust as resources available to the individual to supplemental needs trusts for Medicaid beneficiaries established by those beneficiaries.