Commercial Driver Medical Issues

Under 49 CFR Part 391, Subpart E, no motor carrier may require or permit a commercial motor vehicle driver to operate unless that driver is physically qualified. Physical qualification requires a medical examination by an examiner on the FMCSA National Registry of Certified Medical Examiners and a valid Medical Examiner’s Certificate (Form MCSA-5876). A lapsed, fraudulent, or improperly issued certificate is a federal violation and a significant liability factor when that driver causes a crash.

DOT Physical Exam

Every driver must pass a physical examination by a National Registry examiner before driving a commercial motor vehicle. The exam follows the standards in 49 CFR 391.43 and assesses whether the driver can safely operate a truck without risk to the driver or the public.

When the driver is found medically qualified, the examiner issues a Medical Examiner’s Certificate (MEC), Form MCSA-5876. The driver must carry the certificate and present it to enforcement officials on request, and the motor carrier must keep a copy in the driver’s qualification file.

Exam Standards Under 49 CFR 391.43

The physical examination evaluates the driver across these systems:

• Vision: at least 20/40 acuity in each eye, with or without correction, and the ability to distinguish traffic signal colors
• Hearing: the ability to perceive a forced whispered voice in the better ear at 5 feet or more, with or without hearing aids
• Blood pressure and cardiovascular function
• Neurological function, including any history of seizure disorders, loss of consciousness, or conditions that may cause sudden incapacitation
• Respiratory function
• Musculoskeletal condition, where limb loss or impairment may require a Skill Performance Evaluation (SPE) certificate
• Mental health and substance use history
• Diabetes management, including insulin-treated diabetes

Certification Periods

A Medical Examiner’s Certificate is valid for up to 24 months. Certain conditions shorten that period so the driver is re-examined more often. A driver with insulin-treated diabetes can be certified for up to 12 months under 49 CFR 391.46, and a driver with Stage 2 hypertension can receive a one-time 3-month certificate to bring blood pressure down to 140/90 or lower.

A driver whose certificate has expired is not qualified to operate a commercial motor vehicle. A carrier that dispatches that driver commits a separate federal violation and takes on liability for that trip.

Carrier Obligations Under 49 CFR Part 391

Motor carriers have independent obligations for driver medical certification under federal law:

• Obtain and retain the certificate: the carrier must get a copy of the driver’s current MEC and keep it in the Driver Qualification File.
• Verify the examiner: under 49 CFR 391.51, the carrier must confirm the medical examiner was listed on the National Registry at the time of the examination.
• Track expiration dates: carriers must monitor certificate expiration and pull drivers before their certificates lapse, because operating on an expired certificate violates 49 CFR 391.41.
• Keep unqualified drivers off the road: no motor carrier may require or permit a driver to operate a truck unless that driver is physically qualified under Subpart E.

On April 10, 2025, FMCSA voided over 15,000 unexpired Medical Examiner’s Certificates issued by two examiners found non-compliant with National Registry standards, according to the FMCSA announcement. Carriers employing drivers with those certificates were out of compliance until the drivers were re-examined.

Disqualifying Medical Conditions

Under 49 CFR 391.41(b), a driver is not physically qualified with any of these conditions:

A driver who conceals a disqualifying condition on the medical history form is making a false statement on a federal record.

Medical Certification Violations in Truck Crash Cases

Six medical certification violations come up repeatedly in truck crash cases:

• Lapsed certificate: the driver kept operating after the 24-month or shorter certificate expired, and the carrier failed to track the expiration and pull the driver from service.
• Non-registry examiner: the certificate came from an examiner not listed on the National Registry at the time of the exam or later removed, as in the 2025 FMCSA voidance action.
• Undisclosed condition: the driver failed to disclose a seizure disorder, cardiac condition, sleep apnea, or substance use history, and the examiner cleared the driver on incomplete information.
• Expired hypertension certificate: a driver on a 3-month Stage 2 hypertension certificate kept operating after it expired without a new exam.
• Sleep apnea non-compliance: a driver cleared on the condition of CPAP use and follow-up stopped treatment, and the carrier did not verify continued compliance.
• Fraudulent certificate: the driver obtained a certificate from an examiner who did not conduct a proper exam, which can be a federal crime and creates direct carrier liability when a crash results.

Carrier Liability for Unqualified Drivers

A crash caused by a driver on a lapsed, fraudulent, or improperly obtained medical certificate involves the carrier’s failure to maintain federally required compliance, in addition to the driver’s conduct. That failure of the carrier’s internal processes put a physically unqualified driver on the road.

In serious cases, it may also support a claim for punitive damages under Kentucky law, because a carrier that knew or should have known a driver’s medical certification was defective and dispatched that driver anyway exposes itself to damages beyond compensatory recovery. A review of the driver qualification file combined with certificate verification establishes that carrier-level liability. Related coverage includes truck crash investigations and driver shortage safety risks.