I did not mention it on any of my applications. but once accepted to the school i wanted to go to i did contact the health center and just let them know my situation so that if i were to show up sick they would have some clue as to what was going on. unfortunately, though they were super nice, they didn't always know what to do and would just have me get in touch with my CF docs at UNC. Later in college (Junior year until i graduated) I got pretty sick, pretty often and contacted the disabilities services office and they helped SO MUCH. I would HIGHLY HIGHLY recommend looking them up at the school Josh decides to attend.
It's their job to advocate for students with professors, etc. It doesn't matter the "disability" whether CF or ADD, wheelchair, etc.
When i had to miss extended periods of school for illnesses they helped me out. I can't say enough about how helpful they are.
I've also heard people that had bad experiences with their schools disability services so just look into that office and see what they offer!