How Long Is a DOT Physical Good For? A Plain-Language Guide to Medical Card Validity

What the regulations say about validity periods

Federal Motor Carrier Safety Administration (FMCSA) regulations set 24 months as the maximum validity period for a DOT medical examiner's certificate 1Ref 1Federal Motor Carrier Safety Administration (2024).49 CFR Part 391 — Qualifications of Drivers and Physical Examinations for Commercial Motor Vehicle Drivers.24-month maximum validity period for DOT medical certificates; CDL downgrade rules upon expiration; requirement that medical examiners be listed on the National Registry. In practice, many drivers receive a shorter card because the examining clinician identifies a condition they want to re-evaluate sooner.

Under 49 CFR Part 391, a certified medical examiner may issue a certificate for any period up to but not exceeding 24 months. Common shorter intervals are:

• 12 months — most frequently used for well-controlled hypertension, insulin-treated diabetes, or vision near the threshold
• 6 months — often used for less-stable conditions requiring interim follow-up
• 3 months — used for drivers newly diagnosed with sleep apnea starting CPAP therapy, or while awaiting specialist documentation

If your condition improves, you can return for re-examination sooner with updated documentation from your treating clinician.

What conditions commonly trigger a shorter card?

Several health conditions lead certified medical examiners to issue certificates shorter than two years 2Ref 2Federal Motor Carrier Safety Administration (2024).Medical Examiner's Handbook 2024 Edition.Examination components, certification intervals for specific conditions including hypertension, sleep apnea, and insulin-treated diabetes, and the National Registry requirement for examiners:

• High blood pressure: Drivers with Stage 1 hypertension may receive a one-year card; Stage 2 hypertension typically limits certification to one year after demonstrated BP control.
• Sleep apnea: Not automatically disqualifying, but newly diagnosed drivers starting CPAP therapy typically receive a 3-month certificate. Continued certification requires documented CPAP compliance — generally at least 4 hours per night on at least 70% of nights over a 30-day period.
• Insulin-treated diabetes mellitus (ITDM): FMCSA revised its rules to allow drivers with properly managed ITDM to receive a Medical Examiner's Certificate 3Ref 3Federal Motor Carrier Safety Administration (2018).Qualifications of Drivers; Diabetes Standard — 83 FR 47486 (Sept. 19, 2018).FMCSA revised standards permitting insulin-treated diabetes mellitus drivers to be certified with a maximum 12-month certificate and required MCSA-5870 treating clinician documentation, but the maximum validity for ITDM drivers is 12 months 3Ref 3Federal Motor Carrier Safety Administration (2018).Qualifications of Drivers; Diabetes Standard — 83 FR 47486 (Sept. 19, 2018).FMCSA revised standards permitting insulin-treated diabetes mellitus drivers to be certified with a maximum 12-month certificate and required MCSA-5870 treating clinician documentation. A treating clinician must complete an ITDM Assessment Form (MCSA-5870) attesting to stable regimen and controlled disease.
• Cardiovascular and respiratory conditions: Certain heart conditions require specialist evaluation before certification; some may qualify for only a 1-year card with annual review.
• Vision at borderline thresholds: Drivers who meet minimum standards but just barely may receive a shorter interval for monitoring.

What does a DOT physical exam involve?

A DOT physical is a standardized exam required by federal law for drivers of commercial motor vehicles meeting certain weight, passenger-count, or hazmat thresholds. The exam must be performed by a clinician listed on the FMCSA National Registry of Certified Medical Examiners 2Ref 2Federal Motor Carrier Safety Administration (2024).Medical Examiner's Handbook 2024 Edition.Examination components, certification intervals for specific conditions including hypertension, sleep apnea, and insulin-treated diabetes, and the National Registry requirement for examiners. Only registry-listed examiners can issue a valid DOT medical certificate.

The exam covers: - Vision acuity and peripheral vision - Hearing - Blood pressure and pulse - Urinalysis (screening for diabetes and kidney conditions) - Cardiovascular and respiratory assessment - Neurological screening - Full health history review including all current medications

The visit typically takes 30 to 60 minutes. Bring a complete medication list, any glasses or contacts you use, and documentation from specialists if you have any monitored conditions.

How does the medical card connect to your CDL?

If you hold a commercial driver's license (CDL), your state motor vehicle agency receives your medical certification status through a federal electronic system 1Ref 1Federal Motor Carrier Safety Administration (2024).49 CFR Part 391 — Qualifications of Drivers and Physical Examinations for Commercial Motor Vehicle Drivers.24-month maximum validity period for DOT medical certificates; CDL downgrade rules upon expiration; requirement that medical examiners be listed on the National Registry. Beginning June 23, 2025, FMCSA now transmits examination results directly from certified medical examiners to state driver licensing agencies, reducing paperwork and the risk of administrative lapses.

When your medical card expires or lapses, your CDL automatically downgrades to a non-commercial class — you can no longer legally drive a commercial motor vehicle 1Ref 1Federal Motor Carrier Safety Administration (2024).49 CFR Part 391 — Qualifications of Drivers and Physical Examinations for Commercial Motor Vehicle Drivers.24-month maximum validity period for DOT medical certificates; CDL downgrade rules upon expiration; requirement that medical examiners be listed on the National Registry. Reinstatement requires a new exam, a new certificate, and notification to your state DMV, which may take additional processing time.

Most drivers schedule their DOT physical several weeks before the expiration date to avoid any gap in coverage.

Special certification situations

Several conditions have FMCSA-specific evaluation requirements:

• ITDM: Requires the treating clinician to complete the MCSA-5870 form; maximum certificate length is 12 months regardless of condition stability.
• Sleep apnea: The examiner may require CPAP compliance data download. A 3-month card is standard during the initial CPAP trial period; once compliance is documented, the card can be extended to 1 year at subsequent examinations.
• Vision waivers: Certain drivers who do not fully meet monocular or binocular vision standards may apply for a federal vision exemption program.
• Hearing waivers: Similar exemption programs exist for hearing.
• Heart conditions and implanted devices: Specific conditions require specialist evaluation and review of advisory criteria before certification.

Bring current specialist documentation to any DOT physical if you have a monitored condition — it can be the difference between a full two-year card and a short-interval certificate.