I will NOT give you my social security number

Just got off the phone with a lovely woman in university health services. (I am going to get registered for a respirator so I can clean mold off of books, but that's another story.). Her first question - "what is your social security number?" She was shocked when I refused to give it to her - their system "requires" it. Wait a minute. We still have systems that require social security numbers???? I DO NOT GIVE OUT MY SOCIAL SECURITY NUMBER. Geez.