Diane,
You need to figure out whether (1) there is nothing you need to do for the student; (2) the student doesn't know who to ask about needing something; or (3) someone at your institution who is charged with collecting that information has let things fall through the cracks and you SHOULD have been notified. I'd suggest talking to the student and asking if there is anything you can do to help. If he requests some accommodation, refer him to the appropriate place on campus. If he says, "I'm fine, thanks!" then you can just smile and say, "Great. Let me know if that changes" and move on!
Dr. Jane Jarrow