What do we do if an employee states a medical condition, but doesn’t ask for accommodation?

Q: “A new exempt employee has been having issues completing tasks, and has stated he forgets because he was recently diagnosed with bipolar disorder. We sent a reasonable accommodation request form to be completed by the employee and his physician (and included a full job description). On the first deadline, the employee called out sick. We waited a few days past the deadline and sent a request renewal extending the due date. The employee responded that he would not be requesting an accommodation at this time. Since the employee disclosed to his supervisor his condition as a reason for not competing work and missing deadlines, what are our obligations at this time? Do we still have an exposure because he made the statement? He has been out frequently."  - Lorraine, New York