What DOT Medical Conditions Disqualify CDL Holders?

The DOT medical conditions that can disqualify a CDL holder are set out in 49 CFR 391.41 and cover vision, hearing, heart disease, high blood pressure, breathing problems, epilepsy and other neurological conditions, psychiatric disorders, musculoskeletal and vascular disease, insulin-treated diabetes, substance use, and loss or impairment of a limb.¹ Several of these are absolute bars. Others depend on how well the condition is controlled, and a few have federal exemption or alternative qualification pathways that let you keep driving.

Vision and Hearing

You need distant visual acuity of at least 20/40 in each eye (corrected or uncorrected), a horizontal field of vision of at least 70 degrees in each eye, and the ability to distinguish red, green, and amber traffic signals.¹

If your worse eye falls short but your better eye meets the standard, the alternative vision standard in 49 CFR 391.44 may still qualify you. It requires a Vision Evaluation Report (Form MCSA-5871) from an ophthalmologist or optometrist, a medical examiner’s finding that the deficiency is stable and you’ve had time to adapt, and a road test the first time you qualify this way. The certificate is capped at 12 months.²

For hearing, you must be able to perceive a forced whisper at five feet or more in your better ear, with or without a hearing aid. If you fail the whisper test, audiometric testing follows, and you fail if your average hearing loss in the better ear exceeds 40 decibels at 500, 1,000, and 2,000 Hz.¹ Drivers who can’t meet the standard can apply to FMCSA for a hearing exemption, which must be decided within 180 days.³

Cardiovascular Disease

Any current diagnosis of a cardiovascular condition known to cause syncope, sudden collapse, dyspnea, or congestive heart failure is disqualifying. The regulation specifically names myocardial infarction, angina pectoris, coronary insufficiency, and thrombosis, but the language reaches any cardiovascular disease that could cause loss of consciousness or control of the vehicle.¹

The word doing the work here is “current.” A prior heart attack does not automatically disqualify you if the examiner determines the condition no longer poses a risk of sudden incapacitation. History informs that judgment; it doesn’t decide it.

Blood Pressure

High blood pressure is a separate disqualifying condition under 49 CFR 391.41(b)(6), and readings drive both certification and its length:

Below 140/90: full two-year certification.
Stage 1 (140–159 systolic or 90–99 diastolic): one-year certification.
Stage 2 (160–179 systolic or 100–109 diastolic): a one-time three-month certificate; if your pressure drops below 140/90 within those three months, a one-year certificate follows.
Stage 3 (above 180 systolic or above 110 diastolic): disqualified. Once your pressure falls below 140/90, you may be recertified at six-month intervals.

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This is the condition that most often catches experienced drivers by surprise. Drivers already on antihypertensives should be recertified at least annually.

Respiratory Conditions and Sleep Apnea

Under 49 CFR 391.41(b)(5), any respiratory condition likely to interfere with your ability to safely control a commercial vehicle is disqualifying.¹ No specific diseases are listed; the examiner judges functional impact. Advanced COPD, uncontrolled asthma, and similar conditions can all fall here.

Obstructive sleep apnea gets particular attention because it causes daytime drowsiness. FMCSA’s Medical Expert Panel recommended a sleep study for drivers with a BMI above 33, and screening for those with a BMI of 28 or higher or a neck circumference of 17 inches or more (men) or 15.5 inches or more (women).⁵ Drivers flagged for a sleep study may receive a conditional one-month certificate while testing is completed. A diagnosis doesn’t end your career if you treat the condition effectively (typically with a CPAP) and comply with the treatment plan.

Neurological and Mental Health Conditions

Epilepsy or any other condition likely to cause loss of consciousness is disqualifying.¹ Drivers with a controlled seizure history can apply for a federal seizure exemption through FMCSA.³

Under 49 CFR 391.41(b)(9), any mental, nervous, or psychiatric disorder likely to interfere with safe driving is also disqualifying.¹ The standard is broad by design. A well-managed condition that doesn’t impair driving generally won’t bar you. Active psychosis, severe uncontrolled depression, or any disorder causing unpredictable behavioral episodes will.

Musculoskeletal and Vascular Disease

Under 49 CFR 391.41(b)(7), any rheumatic, arthritic, orthopedic, muscular, neuromuscular, or vascular disease that interferes with safe control of the vehicle is disqualifying.¹ Functional impact controls. Mild arthritis that doesn’t affect grip or pedal work is fine; advanced rheumatoid arthritis that limits range of motion in the hands or legs may not be. Peripheral vascular disease affecting the legs or feet falls here too. The examiner is looking at steering, braking, shifting, getting in and out of the cab, cargo securement, and inspections.

Insulin-Treated Diabetes

Insulin-treated diabetes is not an automatic disqualifier. Under 49 CFR 391.46, you can qualify if the condition is stable and properly controlled.⁶

Before each annual DOT physical, the clinician who prescribes your insulin must complete the Insulin-Treated Diabetes Mellitus Assessment Form (MCSA-5870). That form requires at least three months of blood glucose self-monitoring records from an electronic glucometer that stores readings with dates and times, confirmation of your testing frequency, disclosure of any severe hypoglycemic episodes in the past three months (severe meaning an episode requiring help from another person or causing loss of consciousness, seizure, or coma), an HbA1C result from within the past three months, and an assessment for complications such as kidney disease, cardiovascular disease, neuropathy, foot ulcers, and diabetic retinopathy.⁷

Without at least three months of electronic glucose records, you can’t be certified for more than three months. Even with everything in order, the certificate maxes out at 12 months, and the medical examiner independently decides whether your diabetes is stable enough for safe driving.⁶

Substance Use and Prescription Medications

Any use of a Schedule I controlled substance is an absolute bar. So is use of amphetamines, narcotics, or any other habit-forming drug. A current diagnosis of alcoholism also prevents certification.¹ There is no exemption pathway for either.

Schedule II through V prescriptions are different. You can use them and still drive, but only if the prescribing doctor knows your medical history and has specifically advised you that the drug won’t impair safe operation of a commercial vehicle.¹ This is where drivers get tripped up: a legal prescription is not the same as prescriber clearance to drive. The medical examiner makes the final call regardless of what your treating doctor says, evaluating the medication and the underlying condition for drowsiness, dizziness, slowed reaction, and cognitive effects. The examiner may use the optional CMV Driver Medication Form (MCSA-5895) to gather more information from your prescriber.⁸

Limb Loss and Limb Impairment

Loss of a foot, leg, hand, or arm is disqualifying unless you hold a Skill Performance Evaluation (SPE) certificate. The same applies to any hand or finger impairment limiting grip strength, or any arm, foot, or leg impairment that interferes with normal driving tasks, which include vehicle inspection, cargo securement, and handling emergency equipment.¹

The SPE process requires a medical evaluation from a board-certified physiatrist or orthopedic surgeon (other specialists are not accepted), a road test administered by a motor carrier, and an application package that includes your driving record for the past three years. The evaluation must confirm you can perform both fine-motor tasks and power grip tasks with each hand separately. Once granted, an SPE certificate is valid for up to two years and can be renewed.⁹

Exemption and Alternative Qualification Paths

Federal exemptions exist for three conditions: vision, hearing, and seizures. All apply only to interstate commerce; intrastate driving is governed by state rules, and FMCSA has no authority over it.³

Vision now runs through the alternative standard in 49 CFR 391.44 rather than a separate exemption program.² Hearing and seizure applications go directly to FMCSA with your physical qualification exam records, medical records, driving experience, and motor vehicle history. Decisions take up to 180 days.³ Limb impairments follow the SPE certificate path instead.

If You Don’t Pass

Failing a DOT physical is not necessarily the end of your career. For blood pressure, the examiner may issue a shorter certificate while you get the condition under control. For sleep apnea or diabetes, demonstrating effective management can bring you back into compliance. If you believe the examiner’s decision was wrong, you can get a second examination from a different certified medical examiner; you are not locked into one examiner’s judgment. Where a federal exemption pathway exists, file the application early, because the process runs up to 180 days and you cannot legally drive a commercial vehicle in interstate commerce without a valid certificate.¹⁰

1
eCFR. 49 CFR 391.41 – Physical Qualifications for Drivers
2
eCFR. 49 CFR 391.44 – Physical Qualification Standards for an Individual Who Does Not Satisfy the Vision Standards
3
Federal Motor Carrier Safety Administration. Driver Exemption Programs
4
Federal Motor Carrier Safety Administration. Section 391.41(b)(6): Driver Safety and Health-Medical Requirements
5
Federal Motor Carrier Safety Administration. Expert Panel Recommendations: Obstructive Sleep Apnea and Commercial Motor Vehicle Driver Safety
6
eCFR. 49 CFR 391.46 – Physical Qualification Standard for an Individual With Diabetes Mellitus Treated With Insulin for Control
7
Federal Motor Carrier Safety Administration. Insulin-Treated Diabetes Mellitus Assessment Form MCSA-5870
8
Federal Motor Carrier Safety Administration. Medical Examiner’s Handbook 2024 Edition
9
Federal Motor Carrier Safety Administration. Initial (New Driver) SPE Certificate Application Package
10
Federal Motor Carrier Safety Administration. Are CMV Drivers Who Operate in Interstate Commerce Required to Have a Medical Certificate?