DOT physical A1C requirements: no federal cutoff
Will you pass the DOT physical with diabetes? Diabetes alone won't stop you. The rule looks at control and complications, not a single number, and insulin users follow a paperwork sequence with firm deadlines.
Written by Inely Baez
The diabetes rule in numbers
The DOT physical A1C requirements are simpler than most drivers expect: federal rules set no A1C or blood sugar cutoff. A driver with diabetes can pass when it is properly controlled without disqualifying complications. Insulin users also need Form MCSA-5870 from their treating clinician, and can be certified for up to 12 months.
Most drivers with diabetes who ask about the DOT physical are worried about a number. The federal rule does not work that way. It asks whether your diabetes is controlled, and for insulin users it runs on documents and deadlines.
I lead operations at Simplex, and I read this rule as a sequence: records, a clinician's form, an exam inside the window, and a renewal date. This guide explains the rule. Your clinician and your medical examiner make the medical calls, so talk to your clinician about your own health.
The full briefing, read aloud
8 chapters. Select one to jump to it.
Generated with AI text-to-speech from this article's key insights, in order, rather than reading it word for word. Chapter times come from a transcript of the audio. The article itself was written and reviewed by Inely Baez.
Key takeaways
Diabetes alone does not disqualify you
Drivers with diabetes, including insulin users, can be medically certified when their diabetes is properly controlled.
There is no federal A1C cutoff
FMCSA has said a decision based solely on a specific A1C level is inconsistent with the rule's individualized assessment.
Insulin users need Form MCSA-5870
The treating clinician completes it, and the medical examiner must receive it and examine you within 45 days of the clinician's signature.
Records set the certificate length
With 3 months of electronic glucose records, an insulin user can be certified for up to 12 months. Without them, for no more than 3.
A severe low stops driving
After a severe hypoglycemic episode, an insulin-treated driver may not drive a CMV until a treating clinician clears them on a new MCSA-5870.
In this articleContents
Can you pass the DOT physical with diabetes?
Yes, if your diabetes is properly controlled. The diagnosis alone does not disqualify a driver. The only diabetes-specific standard, in 49 CFR 391.41(b)(3), covers diabetes treated with insulin, and those drivers qualify when they meet 49 CFR 391.46.
The rule does not separate type 1 from type 2 diabetes. What changes the process is whether you use insulin.
| Your treatment | What the examiner needs | Longest certificate |
|---|---|---|
| Diet or non-insulin medication | No diabetes form is required; the examiner judges control case by case | 24 months, if well controlled |
| Insulin, with 3 months of electronic glucose records | Form MCSA-5870 from your treating clinician, signed no more than 45 days before the exam | 12 months |
| Insulin, without 3 months of records | Form MCSA-5870 from your treating clinician | 3 months |
The exam must be done by a medical examiner listed on FMCSA's National Registry of Certified Medical Examiners, under 49 CFR 391.43. FMCSA's DOT medical exam page links to the registry search.
If you once relied on the Federal Diabetes Exemption Program, it ended with FMCSA's 2018 diabetes standard. Insulin users now qualify through the medical examiner instead.
What are the DOT physical A1C requirements?
There is no federal A1C cutoff, and no blood sugar number that automatically passes or fails you. In its 2018 rule, FMCSA said a qualification decision based solely on a specific A1C level is inconsistent with the rule's individualized assessment.
A1C still shows up in the process:
- Insulin users. Form MCSA-5870 asks whether your A1C was measured over the last 12 months, with the most recent result within 3 months, and asks your clinician to attach it. FMCSA has said missing A1C data does not automatically disqualify you.
- Every driver. The exam includes a urinalysis that records sugar, and FMCSA's Medical Examiner's Handbook says excessive sugar may call for further testing.
- Non-insulin diabetes. With your consent, the examiner may ask your provider for medications, side effects, and lab results such as A1C. FMCSA offers a voluntary form for this, MCSA-5872.
If the examiner needs more information before deciding, the determination can be put on hold. You then have 45 days to provide the information or complete further testing.
How do you get certified if you use insulin?
You follow a fixed sequence under 49 CFR 391.46. Each step has a document and a deadline.
Step 1: Keep 3 months of electronic glucose records
Self-monitor as your clinician's treatment plan prescribes, using an electronic glucometer that stores every reading with its date and time and lets the data be downloaded. FMCSA's 2018 rule says a continuous glucose sensor works if it meets those terms. Handwritten logs do not.
Step 2: See your treating clinician
Your treating clinician is the licensed professional who manages your diabetes and prescribes your insulin. They review your records and complete Form MCSA-5870, attesting that you keep a stable insulin regimen and proper control. The form is not a certification decision.
Step 3: Take the exam within 45 days
The medical examiner must receive the signed form and examine you no later than 45 days after your clinician signs it. The examiner considers the form but applies independent medical judgment.
Step 4: Renew at least every 12 months
With 3 months of compliant records, the certificate can run up to 12 months. Without them, it can run no more than 3 months; once you have the records and a new form, you can qualify for the full 12.
Every exam needs a new MCSA-5870, so book the clinician visit first and the exam inside the 45-day window.
What disqualifies a driver with diabetes?
Poor control and serious complications disqualify drivers, not the diagnosis. For insulin users, 391.46 names three situations:
- No stable regimen or proper control: not qualified until that changes.
- Severe non-proliferative or proliferative diabetic retinopathy: not qualified on a permanent basis.
- A severe hypoglycemic episode after certification: no commercial driving until a clinician clears you.
What happens after a severe low?
A severe hypoglycemic episode is one that requires help from others or causes loss of consciousness, a seizure, or a coma. After one, you must stop driving commercial vehicles, report it to a treating clinician, and be evaluated as soon as reasonably practicable.
The prohibition lasts until the clinician finds the cause addressed and your regimen stable, and completes a new MCSA-5870. Keep that form and give it to the examiner at your next exam.
What counts without insulin?
Non-insulin diabetes has no standard of its own, so examiners weigh its effects under the other standards in 391.41(b). The handbook's examples:
- Frequent low blood sugar episodes, under the loss-of-consciousness standard
- Amputations and peripheral neuropathy, under the limb and neuromuscular standards
- Heart complications, under the cardiovascular standard
- High blood pressure linked to diabetes, under the blood pressure standard
- Retinopathy, evaluated as a vascular disease
Limb loss is not always the end of the road: a driver can qualify with a skill performance evaluation certificate.
What should carriers track for drivers with diabetes?
Carriers don't make the medical call, but they own the dates and the file. Medical certification is one of the commercial driver qualification criteria drivers must meet.
- The shorter clock. A driver certified under 391.46 must be re-examined within 12 months, not 24. Track each certificate's actual expiration date, since examiners can issue shorter ones.
- The file. Under 49 CFR 391.51, the medical certificate, or for CDL holders the state driving record showing medical status, belongs in the driver qualification file.
- A failed exam. Since June 23, 2025, when an examiner finds a driver not qualified, every earlier medical certificate for that driver stops being valid.
- The paper card. Since June 23, 2025, CDL and CLP holders no longer need to carry the certificate. Drivers without a CDL still do.
Our DQF checklist covers the rest of the file, and our guide to hiring drivers safely shows where the medical check fits.
How Simplex helps carriers with driver medical rules
We don't make medical decisions. We help you keep driver qualifications, certificates, and files current and ready for an audit.
Driver qualification criteria
We help carriers verify each commercial driver qualification, including medical certification, and keep the records up to date.
Driver qualification files
Our team works with you and your drivers to keep driver qualification files complete and compliant with federal rules.
A program that keeps checking
Our compliance programs include driver qualification file management, CSA monitoring, and mock audits.
Frequently asked questions
What is the maximum A1C for a DOT physical?+
Can you get a CDL with type 1 diabetes?+
What are the DOT requirements for type 2 diabetes?+
Do drivers with diabetes still need an FMCSA exemption?+
Can I use a continuous glucose monitor for my records?+
Where this information comes from
The requirements below come from federal regulations, FMCSA's medical program documents, and the Federal Register, checked on September 24, 2026.
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1
eCFR — 49 CFR 391.46
The insulin-treated diabetes standard: MCSA-5870, the 45-day window, glucose records, retinopathy, and severe lows.
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2
eCFR — 49 CFR 391.41
The physical qualification standards, including the diabetes standard in (b)(3) and the certificate carry rules.
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3
eCFR — 49 CFR 391.43
Exams by National Registry examiners, pending determinations, and certificates voided by a failed exam.
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4
eCFR — 49 CFR 391.45
Re-examination every 24 months, or every 12 months for drivers certified under 391.46.
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5
FMCSA — Insulin-Treated Diabetes Mellitus Assessment Form, MCSA-5870
The treating clinician's form, including the A1C and severe hypoglycemia questions.
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6
FMCSA — Medical Examiner's Handbook, 2024 Edition
How examiners evaluate non-insulin diabetes, the 24-month maximum, and urinalysis.
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7
Federal Register — Qualifications of Drivers; Diabetes Standard
The 2018 final rule: FMCSA's position on A1C, continuous glucose monitors, and handwritten logs.
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8
Federal Register — Non-Insulin-Treated Diabetes Mellitus Assessment Form, MCSA-5872
FMCSA's August 2026 notice on the voluntary form examiners may use for non-insulin diabetes.
Written by
Inely Baez
Chief Operating Officer, Simplex Group
Chief Operating Officer at Simplex Group, with nearly eight years at the company leading operational strategy and execution across compliance, technology, logistics, and performance systems. She is a Certified Public Accountant with a background spanning operations and finance, including leadership roles within Simplex's Freight 4 U division and Velox Transport Solutions. Her work focuses on building scalable, disciplined systems that support long-term performance and growth.
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Plan the exam around the paperwork
The rule asks for control, current records, and, for insulin users, a clinician's form inside a 45-day window. Your clinician handles the medicine. The dates are yours to manage.
If you want help keeping medical certificates and driver qualification files current across your fleet, talk to our team.