How to Complete the FMCSA Insulin Form MCSA-5870

FMCSA Form MCSA-5870, the Insulin-Treated Diabetes Mellitus Assessment Form, is completed by the clinician who manages your insulin and prescribes your treatment, not by you and not by the medical examiner. Before that appointment, you need at least three months of electronic blood glucose records downloaded from a compliant meter and a recent HbA1c result. Once your clinician signs the form, you have 45 calendar days to bring it to a Certified Medical Examiner, who performs your DOT physical and decides whether to issue a medical certificate valid for up to 12 months.¹

What to Have Ready Before Your Clinician Appointment

The single biggest source of delay is glucose data that doesn’t meet the technical requirement. Under 49 CFR 391.46, your readings must come from an electronic glucometer that stores every reading, records the date and time of each one, and allows the data to be electronically downloaded. A handwritten log will not satisfy the rule. You need at least three months of that data before your clinician can complete the form.²

If you’ve been testing on a basic meter that doesn’t store readings electronically, switch well ahead of your certification timeline so a full three months of compliant data has accumulated by the time you sit down with your clinician.

The regulation specifies “electronic glucometer” and doesn’t explicitly address continuous glucose monitors. If you rely exclusively on a CGM, talk with your treating clinician about whether your CGM data satisfies the requirement or whether you should keep a parallel glucometer log for the certification cycle.²

You also need a recent HbA1c result. The form asks whether HbA1c has been measured intermittently over the past 12 months with the most recent result within the preceding three months. FMCSA did not set a hard HbA1c cutoff for disqualification, so the number itself doesn’t automatically decide the case; the clinician records it, and the medical examiner weighs it with everything else.³

Download a blank copy of the form from FMCSA’s website and bring it to the appointment. Some clinicians who don’t regularly treat commercial drivers won’t have seen the form before, and having it in hand along with your downloadable glucose data keeps the visit moving.¹

Who Counts as Your Treating Clinician

FMCSA defines the treating clinician as the healthcare professional who manages your diabetes and prescribes your insulin, as authorized by their state licensing authority. That can be an endocrinologist, a primary care physician, a nurse practitioner, or a physician assistant, provided they are the one actually directing your insulin therapy under their state’s scope of practice.² The clinician does not have to be a specialist.

What the Clinician Fills Out

The clinician evaluates and attests to several specific items on the form:

Whether you’ve maintained at least three months of compliant electronic self-monitoring records.
Whether you’ve had any severe hypoglycemic episode within the preceding three months, meaning an episode that required someone else’s help or that caused loss of consciousness, a seizure, or a coma.
Your most recent HbA1c result, ideally measured within the past three months.
A formal attestation that you maintain a stable insulin regimen and properly controlled diabetes.⁴

The clinician is not deciding whether you can drive. That determination belongs to the Certified Medical Examiner. What the clinician provides is a clinical assessment that feeds into the examiner’s decision.⁴

No Separate Eye Exam Required

The current process does not require an annual dilated eye exam by an ophthalmologist or optometrist. Your general vision will be screened at the DOT physical, and the medical examiner will look for diabetic eye complications, but a separate specialist eye exam is not part of completing Form MCSA-5870.⁵

The 45-Day Deadline

Once your treating clinician signs the form, you have 45 calendar days to get to a Certified Medical Examiner and begin the DOT physical. Miss that window and the form expires; your clinician has to complete a new one.¹ Book the examiner appointment before or at the same time as the clinician visit. Forty-five days sounds generous, but examiner scheduling can eat through it quickly.

What Happens at the Medical Examiner’s Office

You bring the completed MCSA-5870 to a Certified Medical Examiner listed on FMCSA’s National Registry.⁶ This is a different person from your treating clinician. The examiner performs a full DOT physical and reviews the MCSA-5870 as part of the Medical Examination Report (Form MCSA-5875).⁷

The examiner confirms the clinician signed the form within 45 days and attested to a stable insulin regimen, then applies FMCSA’s qualification standards using independent medical judgment. The examiner is not required to accept the clinician’s assessment automatically.³

If the examiner determines you’re physically qualified, they issue a Medical Examiner’s Certificate (Form MCSA-5876). For insulin-treated drivers, the certificate is valid for a maximum of 12 months, so this whole process repeats each year.⁸

If You Don’t Yet Have Three Months of Records

Drivers who can’t produce three months of compliant electronic glucose data aren’t automatically shut out. The examiner has discretion to issue a certificate valid for up to three months, giving you time to collect proper records. Once you provide three months of electronic logs to your clinician and get a new MCSA-5870 completed, the examiner can then issue a certificate for the full 12-month maximum.⁴ It’s a safety valve, not a shortcut, and it means being back in the examiner’s office much sooner.

Conditions That Prevent Certification

Two diabetic eye conditions permanently disqualify a driver from commercial operation: severe non-proliferative diabetic retinopathy and proliferative diabetic retinopathy. If the examiner identifies either diagnosis, no certificate can be issued. Mild or moderate non-proliferative retinopathy does not automatically disqualify you, though the examiner will factor it into the overall assessment.³

What You Have to Do After You’re Certified

Certification is not the end of the compliance obligations tied to the form. Between annual exams, you must continue self-monitoring your blood glucose according to your treating clinician’s plan, using a compliant electronic glucometer that stores every reading with a date and time stamp. Those logs are the same records your clinician will review at your next certification cycle, so gaps in the data create problems later.²

If you have a severe hypoglycemic episode after certification, you are immediately prohibited from operating a commercial motor vehicle. You must report the episode to your treating clinician as soon as reasonably practicable. The driving prohibition stays in effect until the clinician confirms the cause has been addressed, verifies you’re back on a stable regimen, and completes a new MCSA-5870. Only then can you return to driving.³

FMCSA does not require you to carry specific supplies like glucose tablets or a backup monitor in the cab, leaving that judgment to individual drivers.⁵

1
Federal Motor Carrier Safety Administration. Insulin-Treated Diabetes Mellitus Assessment Form, MCSA-5870
2
eCFR. 49 CFR 391.46 – Physical Qualification Standards for an Individual With Diabetes Mellitus Treated With Insulin for Control
3
Federal Register. Qualifications of Drivers; Diabetes Standard
4
Federal Motor Carrier Safety Administration. Insulin-Treated Diabetes Mellitus Assessment Form MCSA-5870
5
Federal Motor Carrier Safety Administration. Qualifications of Drivers; Diabetes Standard
6
eCFR. 49 CFR Part 390 Subpart D – National Registry of Certified Medical Examiners
7
Federal Motor Carrier Safety Administration (FMCSA). FMCSA Medical Examiner Handbook
8
eCFR. 49 CFR Part 391 Subpart E – Physical Qualifications and Examinations