Social Security Administration – Update Records

https://faq.ssa.gov/link/portal/34011/34019/Article/2856/How-do-I-change-my-gender-on-Social-Security-s-records

Social Security

Under current policy, a transgender person can change their gender on their Social Security records by submitting either government-issued documentation reflecting a change, or a certification from a physician confirming that they have had appropriate clinical treatment for gender transition.