Driving with Diabetes: The Insulin Rules and the MCSA-5870 Form

Reviewed by the Evolve Health clinical team · 2026-10-17 · 8 min read

Three questions come up every time a driver on insulin books with us: Can I even get a medical card on insulin? Who fills out this 5870 form — you, or my regular doctor? And why is my card only good for a year when other drivers get two? All three have clean answers under the current federal rule (49 CFR 391.46).

The 2018 rule change: no more exemption

Before November 19, 2018, insulin-treated diabetes was an automatic disqualification for interstate commercial driving. The only way through was an individual federal exemption — a separate FMCSA application with its own paperwork and renewals stacked on top of the regular medical exam. The 2018 final rule replaced that system. Today, insulin-treated diabetes is handled the way other manageable conditions are: your treatment is documented, a medical examiner evaluates you, and you are certified for a defined period — a maximum of 12 months at a time. No exemption application, no separate federal certificate to carry.

Step 1: your treating clinician completes the MCSA-5870

The MCSA-5870 is the Insulin-Treated Diabetes Mellitus Assessment Form, and it belongs to your treating clinician — the clinician who prescribes your insulin and manages your diabetes. The medical examiner does not fill it out; the examiner reviews it. The timing matters: the form must be signed and dated no more than 45 days before your DOT exam, so schedule the two appointments as a pair, form first.

On the form, your treating clinician documents your insulin regimen and how stable it has been, reviews your glucose control, screens for complications of diabetes, and confirms that you have had no severe hypoglycemic episode in the preceding 12 months. Two practical points decide how long your card runs:

• Bring at least three months of glucose records. The rule calls for blood glucose records from an electronic meter that stores dated readings and can be downloaded — the printout or the meter itself goes to your treating clinician. With at least the preceding three months of records, you can be certified for the full 12 months.
• Short records mean a short first card. If you are new to insulin or cannot yet provide three months of records, certification is capped at 3 months until the records exist and a new MCSA-5870 is completed. That is the records clock, not a failure — many drivers get a 3-month card first and a 12-month card at the follow-up.

What counts as a severe hypoglycemic episode

The rule uses a specific definition. A severe hypoglycemic episode is a low blood sugar event that requires the assistance of another person, or that results in loss of consciousness, seizure, or coma. An ordinary low that you recognize, treat yourself, and recover from does not count as a severe episode — it is part of the record your clinicians review, but it does not reset any clock by itself.

If a severe episode happens while you are certified, the rule is strict and simple: stop operating a commercial motor vehicle, report the episode to your treating clinician as soon as reasonably practicable, and be evaluated. You do not return to driving a commercial vehicle until your treating clinician has evaluated the episode, addressed what caused it, and completed a new MCSA-5870. There is no shortcut around that sequence, and hiding a severe low puts both your health and your certification at risk.

Step 2: the DOT exam itself

With a current MCSA-5870 in hand, the rest is the standard DOT physical, with extra attention to the places diabetes touches driving. The examiner reviews the form and your records, then works through the full exam — the blood pressure ladder, vision, and hearing standards are covered in our guide to what disqualifies you from a DOT physical. For a driver with diabetes, the examiner is also checking the complications that affect the job itself: sensation in your feet for pedal feel, kidney function, and the state of your eyes. If everything qualifies, the certificate runs up to 12 months — and the whole cycle (new form, new exam) repeats annually.

The A1C question: there is no federal cutoff

Drivers often arrive asking what A1C they need to pass. FMCSA does not publish a single A1C cutoff for certification — there is no federal pass-or-fail A1C number in the rule. Your A1C is one piece of evidence of control that your treating clinician and the medical examiner weigh together with your glucose records, the stability of your insulin regimen, and your hypoglycemia history. (Our decoder on your numbers, explained walks through what A1C measures.) What the standard asks for is documented, steady control — exactly what the form and your meter records show.

Not on insulin? Your path is simpler

Diabetes managed by diet or oral medication does not use the MCSA-5870 at all — there is no 45-day form step. The examiner evaluates your control and any complications at the exam itself. Two things still apply: the examiner will want to see that your blood sugar is controlled and that eye, kidney, or nerve complications are not affecting your ability to drive, and a medical card for a driver with diabetes still runs a maximum of 12 months rather than two years. Bringing recent labs and your medication list makes that conversation short.

Eyes, kidneys, and feet: the checks around the exam

• Vision. The federal vision standard applies to every driver, and diabetic retinopathy is the diabetes-specific risk behind it — advanced retinopathy can put the standard out of reach. Regular diabetic eye screening catches changes while they are still treatable and keeps exam day free of surprises.
• Kidneys. Kidney function is part of the diabetes picture your clinicians track with routine labs, and significant kidney disease factors into certification decisions. Steady primary care between DOT exams keeps this a non-issue.
• Feet and nerves. Neuropathy reduces sensation in the feet — the same feet working the pedals. The examiner checks for it, and new numbness or tingling is worth reporting to your treating clinician promptly, not at your next renewal.

This is also where the broader risk picture matters: diabetes tends to arrive earlier and at lower body weights in South Asian adults, a pattern we cover in our guide to diabetes risk in South Asian adults — screening early keeps a manageable condition manageable.

Low blood sugar on the road: the working rules

• Never drive through a low. If you feel a low coming on, pull over safely, treat it, recheck, and wait until your glucose is back in range and steady before rolling again. A delivery window is never worth a hypoglycemia crash.
• Keep your kit in the cab. Your meter and fast-acting glucose stay within reach in the truck, not in the trailer or at home — and you self-monitor on the schedule your treating clinician set in your treatment plan, which is what the rule requires.
• Treat a severe episode as a certification event, not just a bad day. If a low ever needs another person's help, the stop-report-evaluate sequence above is mandatory — and it protects your card in the long run, because the new MCSA-5870 documents that the cause was found and fixed.

At Evolve Health: the treatment and the exam in one clinic

Evolve Health handles both halves of this process. We provide ongoing diabetes care and management, and we perform FMCSA DOT physicals in Denton — $99 with code EVOLVE, in person, with your certificate issued the same day if you qualify. That leaves two ways the paperwork can work:

• If you treat elsewhere: ask your treating clinician to complete and sign the MCSA-5870 within 45 days before your exam, and bring it with you, along with at least three months of meter records, your insulin and medication list, and any recent A1C results or eye exam reports.
• If Evolve Health is your treating clinic: your treating clinician here completes the MCSA-5870 as part of your diabetes care, and your DOT exam follows inside the same 45-day window — no faxing forms between offices, and the clinician signing your form is looking at the same records the examiner reviews.

Either way, the sequencing is the whole game: form first, exam within 45 days, card for up to 12 months. Call us and we will help you line the two appointments up in the right order.

Frequently asked questions

Can I get a CDL medical card if I take insulin?

Yes. Since November 19, 2018, insulin use by itself no longer disqualifies you and no federal exemption is required. Your treating clinician completes form MCSA-5870 within 45 days before your DOT exam, confirming a stable insulin regimen, proper control, and no severe hypoglycemic episode in the preceding 12 months. The medical examiner reviews the form and can certify you for up to 12 months.

Who fills out the MCSA-5870 — my own clinician or the DOT examiner?

Your treating clinician fills it out — the clinician who prescribes your insulin and manages your diabetes. The medical examiner does not complete the form; the examiner reviews it as part of your DOT physical. If Evolve Health is your treating clinic, your treating clinician here completes the MCSA-5870 and your DOT exam follows under the same roof. If you treat elsewhere, have your clinician sign the form within 45 days before your exam and bring it with you.

How long is my medical card good for if I use insulin?

Up to 12 months — never two years. Insulin-treated diabetes is certified for a maximum of one year at a time, with a fresh MCSA-5870 and a new exam at every renewal. One exception: if you cannot yet provide at least three months of electronic blood glucose records, certification is limited to 3 months until those records exist and a new form is completed.

What A1C do I need to pass a DOT physical?

FMCSA does not set a single A1C cutoff for certification — there is no federal pass-or-fail A1C number. Your A1C is one piece of evidence your treating clinician and the medical examiner weigh together with your glucose records, how stable your insulin regimen is, and whether you have had severe hypoglycemic episodes. Documented, steady control is what the standard asks for.

What happens if I have a severe hypoglycemic episode while I am certified?

You must stop operating a commercial motor vehicle, report the episode to your treating clinician as soon as reasonably practicable, and be evaluated. A severe hypoglycemic episode is a low that requires another person's assistance, or causes loss of consciousness, seizure, or coma. You may not return to driving a commercial vehicle until your treating clinician has evaluated the episode, addressed the cause, and completed a new MCSA-5870 form.

How much does a DOT physical cost at Evolve Health, and what should I bring?

The DOT physical at Evolve Health in Denton is $99 with code EVOLVE, in person, and your certificate is issued the same day if you qualify. Bring your completed MCSA-5870 form if your treating clinician is elsewhere, at least three months of blood glucose records from your meter, your insulin and medication list, and any recent A1C results or eye exam reports you have.

Sources

• 49 CFR 391.46 — Physical qualification standards for an individual with diabetes mellitus treated with insulin for control (the 2018 FMCSA rule: MCSA-5870 process, 45-day window, 12-month maximum certification, severe hypoglycemic episode definition)
• Federal Motor Carrier Safety Administration — Insulin-Treated Diabetes Mellitus medical certification process (treating clinician evaluation, glucose records, and the annual exam sequence)
• Federal Motor Carrier Safety Administration — Insulin-Treated Diabetes Mellitus Assessment Form, MCSA-5870 (the form itself, available from FMCSA's medical regulations pages at fmcsa.dot.gov)

General education only: This article explains the federal certification process for insulin-treated drivers in general terms. Your treating clinician and the certified medical examiner make the actual qualification decisions under the current FMCSA standards.