Diabetes and DOT Physicals: Insulin, A1C and Medical Certification

Diabetes does not automatically prevent a driver from qualifying for a DOT medical certificate. The evaluation depends on treatment, control, complications and the other medical qualification standards. The distinction between insulin-treated and non-insulin-treated diabetes matters.

This guide describes the federal interstate medical-certification framework. State intrastate requirements may differ. A CDL or CLP is a licensing category; medical-certificate requirements depend on the driving operation as well as the license.

Does FMCSA require an A1C below 10%?

No universal federal A1C pass/fail cutoff of 10% applies under the insulin-treated diabetes rule. FMCSA rejected using a single A1C result as the sole qualification test. A1C can inform the assessment, but the treating clinician and certified medical examiner consider the driver’s individual circumstances. A good result does not guarantee certification, and a high result still warrants clinical attention. See the FMCSA diabetes final rule, discussion of HbA1C levels.

A single glucose reading is also not a universal DOT pass/fail test. Do not change prescribed treatment or try to manipulate a reading for the exam. Discuss glucose targets and treatment with the clinician managing your diabetes.

If you use insulin

Your treating clinician must complete Form MCSA-5870. The medical examiner must receive the form and begin the examination within 45 days after the clinician signs it. The clinician assesses insulin-regimen stability and diabetes control; the medical examiner makes the certification decision.

• Certification under the insulin-treated diabetes standard can last up to 12 months, rather than two years.
• At least the preceding three months of compliant electronic glucose self-monitoring records must be provided to the treating clinician for eligibility for the full certification period. Without those records, certification cannot exceed three months and is not guaranteed.
• Complications and severe hypoglycemic episodes can affect qualification. Drivers who experience a severe hypoglycemic episode after certification must stop operating a commercial motor vehicle and obtain the required treating-clinician evaluation before resuming under the rule.

See 49 CFR 391.46 for the complete requirements, including glucose records and retinopathy provisions. The former federal diabetes exemption program has been replaced by this standard.

If you do not use insulin

The insulin-specific requirements do not automatically apply. The examiner evaluates non-insulin-treated diabetes case by case; well-controlled diabetes may permit certification for up to 24 months. Symptoms, medication effects and complications may justify a shorter period or prevent qualification. FMCSA’s 2024 Medical Examiner’s Handbook, section 4.12, explains this distinction.

Preparing for your Charlotte appointment

Bring your medication list, relevant recent results and the records requested by your examiner. If you use insulin, arrange the treating-clinician assessment and MCSA-5870 before the appointment. Call ahead to clarify what documentation to bring; this page does not replace individualized medical advice or establish an office-specific laboratory cutoff.

At Beyond Wellness, a DOT physical costs $85. A drug test, if needed, is an additional $85. Call 704-461-1836 or email admin@beyondwellnesscc.com for appointment questions. Choose your appointment type.

After the examination, see our North Carolina medical-certificate and NRII guide for reporting and self-certification information.