[Kate*]

Yes, as long as you can prove you have a diagnosis (They are allowed to ask for documentation), you are entitled by law to reasonable accommodations. I don't think they can legally ask about details, but you can disclose as much or as little as you're comfortable with, or whatever is necessary if they want to fight you on something.

It will depend on the culture and environment of the workplace and what the accommodation is. Some places are relaxed, and if it sounds reasonable or like common sense, they'll do it; others are very much "by the book" and have certain procedures you'd have to follow.

If you ever do have to ask, you can say something (to your supervisor or HR) like "Because I have a disability, I'm struggling with X part of my job and need an accommodation." They should give you specifics from there of how to go about it.