Violation code

391.45(b)

Expired medical examiner's certificate

Driver Fitness1Non-OOS· SMS Appendix A v3.20

391.45(b) is a Medical Certificate violation under 49 CFR §391.45(b). It falls in the Driver Fitness BASIC with a severity weight of 1/10. Nationally it was cited 25,400 times in the last five years, with an OOS rate of 4.4%.

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National roadside inspection stats

as of 6/20/2026

Inspections

25,393

that found this code

Violations

25,400

total written

OOS rate

4.4%

1,116 OOS

Source: FMCSA roadside inspection data (last 5 years). The OOS rate is the share of these violations that led the officer to mark the driver or vehicle out of service.

Violation group: Medical Certificate
Regulation §: 391.45(b)
Severity weight: 1
Used in SMS: Yes
Status: Active
Updated: 6/20/2026

Last updated June 2026

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Notes

DSMS: Y

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Challenging 391.45(b) through FMCSA DataQs

If this violation was written incorrectly, here are the angles trucking-safety managers use to contest it. Playbook: Driver Fitness.

Relevant 49 CFR49 CFR § 391.45

Persons who must be medically examined and certified

“Except as provided in §391.67, the following persons must be medically examined and certified as physically qualified to operate a commercial motor vehicle: any person who has not been medically examined and certified as physically qualified to operate a CMV; any driver whose medical examiner's certificate has expired.”

Common ways to challenge this code

Medical certificate was valid and on file
A valid medical examiner's certificate was in the driver's qualification file and was either not produced at roadside or not properly recognized.
Evidence that wins
- ✓Copy of the valid medical examiner's certificate
- ✓Driver qualification file index
- ✓National Registry verification printout
CDL class / endorsement was correct for the operation
The driver's CDL class and endorsements were correct for the vehicle and cargo being operated.
Evidence that wins
- ✓Copy of the valid CDL with endorsements
- ✓Vehicle registration showing GVWR/configuration
- ✓Bill of lading or shipping papers showing cargo

Common pitfalls — avoid these

⚠A medical certificate that expired the DAY of inspection still fails — there is no grace period

⚡ Draft a challenge for 391.45(b) →Read the DataQs guide first

More codes in Driver Fitness

Same BASIC category — ranked by national citation volume

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Other Medical Certificate codes

Codes under the same FMCSA violation group

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Frequently asked questions about 391.45(b)

What does violation 391.45(b) mean?

391.45(b) is the FMCSA roadside-inspection violation code for "Expired medical examiner's certificate", part of the Medical Certificate group, cited under 49 CFR §391.45(b).

What BASIC does 391.45(b) affect?

391.45(b) falls under the Driver Fitness BASIC in the FMCSA Safety Measurement System (SMS).

What is the CSA severity weight of 391.45(b)?

391.45(b) carries a severity weight of 1 out of 10. Higher weights indicate violations more closely tied to crash risk, and they count more toward a carrier's Driver Fitness score.

Is 391.45(b) an out-of-service (OOS) violation?

No. 391.45(b) is not an out-of-service violation, so on its own it does not trigger an out-of-service order at the roadside.

How many CSA points does 391.45(b) add to a carrier's score?

The point contribution of 391.45(b) depends on its severity weight (1/10) multiplied by a time weight of 3, 2, or 1 based on how recent the inspection is. You can calculate the exact contribution with the CSA points calculator.

Can 391.45(b) be challenged through DataQs?

Yes. If you believe 391.45(b) was recorded in error, you can file a Request for Data Review (RDR) through the FMCSA DataQs system with supporting evidence. A successful challenge can remove or correct the violation on your record.

Keep going

CSA points calculator How to challenge a violation Draft a DataQs letter for 391.45(b)Driver Fitness BASIC Carrier CSA lookup CSA glossary