The Obama administration on Friday ended a 33-year ban on Medicare coverage for gender reassignment surgery — a major victory for transgender rights and a decision that is likely to put pressure on more insurers to provide coverage for such services. The ruling by a Department of Health and Human Services board was in response to a lawsuit filed last year on behalf of Denee Mallon, 74, a transgender woman and army veteran from Albuquerque. The blanket Medicare ban was put in place in 1981 when such surgeries were considered experimental.