What happens if I have a commercial driver license, Class A,B,or C or CDL permit?
You must certify the type of driving you do anytime you perform a license transaction other than address change or duplicate license and be required to choose only one driving type.
how do I contact Medical Certification Unit by mail?
You can contact them by mail at NYS DMV Medical Certification, Unit PO Box 2601, Albany, NY 12220-0601.