A DOT physical is good for up to 24 months, and that is the longest certificate any commercial driver can receive. Certain health conditions shorten it: a driver with elevated blood pressure, insulin-treated diabetes, or vision certified under the alternative standard is typically limited to a one-year card, and some situations bring it down to six or even three months. The date on the certificate is what counts, not the date your state processes it.
The Two-Year Maximum and When the Clock Starts
Federal regulations require any commercial motor vehicle driver who has not been medically examined and certified within the preceding 24 months to undergo a new examination before driving.1eCFR. 49 CFR 391.45 – Persons Who Must Be Medically Examined and Certified Pass the physical with no conditions that need closer monitoring and the medical examiner issues a certificate good for the full two years. There is no longer option available, no matter how healthy you are.
The clock starts the day the examiner signs the certificate. Complete your exam on June 1 and the certificate expires on May 31 two years later, regardless of when your state licensing agency receives the paperwork. Plan your next exam against the signature date, not the date the DMV updated your record.
Conditions That Cut the Certificate Shorter
The two-year card is the default. Several health conditions push you into shorter certification periods, and the examiner sets the interval based on how well-controlled the condition is.
Blood Pressure
Blood pressure is the single most common reason drivers walk out with a short-duration certificate. FMCSA sets clear thresholds:2Federal Motor Carrier Safety Administration. Section 391.41(b)(6) – Driver Safety and Health Medical Requirements
- Below 140/90: full two-year certification.
- 140–159 / 90–99 (Stage 1): one-year certification.
- 160–179 / 100–109 (Stage 2): a one-time three-month certification to get treatment started. Bring it below 140/90 within those three months and you can receive a one-year certificate.
- 180/110 or higher (Stage 3): disqualified until your blood pressure drops below 140/90, then certified at six-month intervals.
A driver whose blood pressure creeps up between exams can go from a two-year card to a one-year card with no other change in health.
Insulin-Treated Diabetes
Drivers who use insulin to manage diabetes are limited to a maximum 12-month certification period.1eCFR. 49 CFR 391.45 – Persons Who Must Be Medically Examined and Certified Since 2018, a certified medical examiner can evaluate insulin-treated drivers directly in consultation with the driver’s treating clinician, replacing the older federal exemption process.3Federal Motor Carrier Safety Administration. FMCSA Eliminates the Federal Diabetes Exemption Program Annual exams still apply.
Vision Under the Alternative Standard
If you don’t meet the standard vision requirement in your worse eye, you may still qualify under the alternative vision standard that replaced the old federal vision exemption program in 2022.4Federal Motor Carrier Safety Administration. General Vision Exemption Package Certification under this standard is limited to 12 months.1eCFR. 49 CFR 391.45 – Persons Who Must Be Medically Examined and Certified
Other Conditions the Examiner Flags
The examiner has broad discretion to shorten your certificate for any condition that warrants closer monitoring. Cardiovascular issues, sleep apnea under treatment, seizure history, and musculoskeletal problems can each lead to six-month or one-year cards. The reason is documented on the medical examination report form, so you will know exactly why your certificate was shortened.
What Happens If You Let It Lapse
Federal rules require you to provide your updated medical certification to your state licensing agency. Fail to do so within 60 days of expiration and your state DMV will automatically downgrade your CDL to a regular non-commercial license. Once downgraded, you cannot legally operate a commercial vehicle, and restoring your CDL typically requires retaking the skills test you passed when you first got the license.
Details of the downgrade process vary by state, but the 60-day federal framework is consistent. Between a new physical, skills test fees, possible refresher training, and lost wages while you wait for a test appointment, restoring a downgraded CDL can easily run over $1,000 and several weeks off the road. Renewing on time avoids all of it.
One more piece worth knowing: the examiner issues the Medical Examiner’s Certificate (Form MCSA-5876) and reports results to FMCSA electronically, but getting the certificate into your state DMV record is your responsibility.5Federal Motor Carrier Safety Administration. Medical Examiners Certificate – Commercial Driver Medical Certification That handoff is where most drivers run into trouble.
If You’re Disqualified or Disagree With the Result
A disqualification from one examiner is not the end of the road. FMCSA guidance lets you seek a second opinion from another certified medical examiner on the National Registry.6Federal Motor Carrier Safety Administration. National Registry of Certified Medical Examiners The second examiner performs a full, independent evaluation rather than reviewing the first examiner’s work. If that examiner finds you qualified, the resulting certificate is valid. Examiners can reasonably differ on borderline cases, particularly around sleep apnea and controlled hypertension where clinical judgment carries more weight.