Student health insurance is probably going to vary by school, so you'd need to look at the specifics of the policy to see what the requirements are for everything. Some plans require you to follow a certain progression before they'll agree to pay for things (ie. you see a therapist for 6 months, you go on hormones for a year, you have top surgery, you have a hysto, you have bottom surgery - and they'll pay as long as you do it in that order within their guidelines). Some plans just say they'll cover everything, but your doctor/surgeon needs to write a letter of medical necessity or request a pre-authorization.
When in doubt, contact the customer service representatives at the insurer. They may need to look it up or get back to you when a supervisor is available, but typically they're going to be able to give you the most in depth answer for your specific plan.