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My medical certificate is still valid. Am I prohibited from operating a CMV if I have a medical condition that developed after my last medical certificate was issued?

FMCSA regulations prohibit a driver from beginning or continuing to drive if their ability and/or alertness is impaired by: fatigue, illness, or any cause that makes it unsafe to begin (continue) to drive a commercial vehicle.
Even if a driver currently has a valid medical certificate, the driver is prohibited from driving a CMV with any medical condition that would be disqualifying or may interfere with the safe operation of a CMV. Once a disqualifying medical condition is resolved, and before resuming operation of CMVs, a driver is responsible for obtaining re-certification from a Medical Examiner. 391.45

Last Updated : April 1, 2014