I live in the United States and am, as of Wednesday, legally nonbinary/x without being intersex. My court order also says that my title is legally Mx.
I provided proof of “appropriate clinical treatment for gender dysphoria…. under penalty of perjury” in the form of a written and signed letter on clinic letterhead from my doctor, as well as an extra unnecessary letter from my therapist.
If you’re nonbinary, you can do this too. I believe in you!