Up to 24 months. That is the maximum, not the default, and a significant number of drivers receive shorter certificates because of a condition the examiner needs to monitor.
The maximum and the exceptions
A certified examiner issues a medical examiner’s certificate valid for up to two years. The certificate is shortened when a condition requires follow-up sooner. Common reasons:
- Elevated blood pressure. The most frequent cause by a wide margin. Moderately raised readings typically produce a one-year certificate, with shorter periods as readings climb.
- Diabetes requiring medication, where periodic review of control is needed.
- Sleep apnoea under treatment, where the examiner wants to confirm ongoing CPAP compliance.
- Heart conditions, often requiring annual review and specialist clearance.
- Any condition being actively treated where stability has not yet been established.
A shorter certificate is not a failure. You are certified and driving legally. You are simply being reviewed sooner.
What happens when it expires
You cannot legally operate a commercial motor vehicle without a valid certificate. There is no grace period. An expired certificate can also affect your CDL status depending on your state’s rules, since many states link the medical certificate to the licence record.
The practical risk is not a roadside citation on day one. It is being pulled from work by your employer’s compliance check, which costs you driving days.
When to renew
Book your renewal a few weeks before the expiry date, not a few days. That buffer matters for one specific reason: if the examiner asks for documentation you do not have: a current A1C, a sleep study, a specialist clearance letter. You have time to get it without a gap in certification.
Set a reminder for 60 days out. Keep a photo of the certificate on your phone alongside the paper copy.
The blood pressure problem
Worth its own section because it is the single most common reason drivers pay for exams more often than they need to.
A reading pushed up by rushing through the door, a large coffee, or ordinary nerves can cost you twelve months of certification. Sit quietly for a few minutes before the reading. Go easy on salt and caffeine that morning. If you are on blood pressure medication, take it as prescribed and bring the details.
If your blood pressure is genuinely elevated, treating it is what restores a full-length certificate. That is a conversation with a primary care provider rather than something the examiner can resolve on the day.
Renewing at Maxem Health
Maxem Health charges $100 for a DOT physical, published on the employer services page. Clinics take walk-ins seven days a week including holidays, so a renewal does not have to cost you a working day. Save your spot online to shorten the wait.
DOT physicals are excluded from the Discount Program, and employment-related exams are generally not an insurance benefit.
Frequently asked questions
Can a DOT physical be valid for less than two years?
Yes, and it often is. Examiners issue shorter certificates when a condition needs monitoring. Elevated blood pressure is the most common reason.
Is there a grace period after expiry?
No. You need a valid certificate to operate a commercial motor vehicle. Renew before the expiry date rather than after.
Can I renew early?
Yes, and it is sensible. Renewing a few weeks early leaves room to gather any documentation the examiner asks for without a gap in certification.
Do I need the same examiner each time?
No, but the examiner must be listed on the FMCSA National Registry. Bringing your previous certificate and documentation helps whoever performs the exam.
Walk in at a Maxem Health clinic
Maxem Health Urgent Care has 15 clinics across Mississippi, Louisiana and Oregon, open seven days a week including holidays. Most clinics run Monday to Saturday 8am to 8pm and Sunday 9am to 6pm, though hours vary by location. Walk in for a DOT physical renewal seven days a week.
Save your spot at your nearest Maxem Health clinic, or find clinic addresses and hours.
Federal medical standards are set by the FMCSA. See the FMCSA medical regulations for the authoritative requirements.
This article is general health information, not medical advice. It does not replace an evaluation by a licensed provider. If you are worried about your symptoms, get seen.