Well, my doctor recorded my diagnosis as "Endocrine Disorder, unspecified" (259.9). At my clinic I go to, the doctors believe in treating you based on what your medical needs are and what you feel you need (dependent upon your physical, of course), because they believe nothing's technically "wrong" with you and they don't play games with you. And they have a specific team of providers who are experienced with treating trans patients. They're there to advise you of the proper medical decisions, and let you be the judge of who you are, because really you are the only person that knows truly who you are. I've had a visit with a therapist there as well, and it's pretty much the same. They want to help you with your needs, and help you sort through your emotions & any stress caused going through the process, and offer good advice on how to move forward and be yourself, as opposed to testing you on who you are.
They also will offer me what they call a "safe pass" letter at anytime I'm ready for it (in which this case I've informed my doctor of required Ohio BMV form to be signed, and he said to bring it in next apt).
They had me in and out with what I needed in 3 appointments, 5 days. And they're super affordable!
The folks at Howard Brown Health Center in Chicago have been wonderful thus far! (Which reminds me, I need to write a thread on my experience there.) If you're anywhere in the Midwest, I'd recommend checking them out.