Social Security and Medicare Parity Act of 2015

Social Security and Medicare Parity Act of 2015 Amends title II (Old Age, Survivors and Disability Insurance) (OASDI) of the Social Security Act with respect to the determination of a valid marriage to account for marriages in jurisdictions other than a state. Authorizes the courts of any state to find that an OASDI benefit applicant and an insured individual were validly married in a jurisdiction other than a state at the time the applicant files a benefit application or, if the insured individual is dead, at the time the individual died. Waives the nine-month marriage requirement to make eligible for widow or widower benefits certain widows or widowers whose marriage to a deceased individual would not have been treated as a marriage for federal law purposes before June 26, 2013. Waives the same requirement for anyone who became a stepchild of the deceased individual as a result of such a marriage. Waives the one-year marriage requirement to make eligible for husband's or wife's OASDI benefits certain husbands and wives whose marriage to an individual would not have been treated as a marriage for federal law purposes before June 26, 2013. Waives the same requirement for anyone who became a stepchild of the individual as a result of such a marriage. Directs the Commissioner of Social Security to conduct a comprehensive and effective three-year outreach campaign to encourage benefit applications by individuals newly eligible for OASDI benefits as a result of changes in law relating to same-sex marriage and occurring on or after June 26, 2013.