Chapter 6. D.O.T. Medical Cards Expiration Medical examiner's certificates are valid for no more than two years. Some medical conditions may require you to have a physical examination more frequently and others may disqualify you from driving a commercial motor vehicle (CMV). Physical Qualifications Physical qualifications are listed in CFR 49 s. 391.41. If you do not meet the vision or diabetes physical qualification standards, or have a loss of impairment of limbs (arms, hands, finders, legs or feet) and want to operate an interstate commercial vehicle (CMV), you may be able to satisfy alternative physical qualifications or qualify for an exemption. Contact the Massachusetts State office of FMCSA at 781-425-3210 for additional details. Information is also available on the FMCSA website. If you cannot meet the medical qualifications for CMV Interstate commercial operation, you may qualify for an Intrastate Medical Waiver. The waiver, available from the RMV, would permit operation of a CMV used in MA intrastate commerce only. Call 857-368-8020 for specific details or see the Medical Waiver Application. 12/16