ADA, the Americans with Disabilities Act rules.
Under ADA, Gender Identity Disorder is expressly acknowledged to be a disability and expressly called out that it is a disability
. Moreover it is a disability that is expressly excluded
from benefits. See Americans with Disabilities Act of 1990, Section 511, codified at 42 U.S.C. 12211(b)(1). http://www.ada.gov/pubs/adastatute08.htm
SSI benefits for SEVERE depression is possible. But NOT if the depression is connected to any of transvestism, transsexualism, pedophilia, exhibitionism, voyeurism, gender identity disorders not resulting from physical impairments, or other sexual behavior disorders; compulsive gambling, kleptomania, or pyromania; psychoactive substance use disorders resulting from current illegal use of drugs.
Thus, if you want to get SSI it is necessary to ensure that the Feds do not find out about your GID if you have it.
It is often said that most criminals in prison are there because they convicted themselves out of their own mouths. Every thing you don't say to a mental health professional is something that cannot be used against you in a context of SSI.