Yes, you must keep a current USDOT Medical Examiners Certificate on file with the DMV if you self-certify to a Non-Excepted Driving type NA or NI.
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?