FMCSR 391.43H: Improper Medical Certificate Form — Driver Q&A

Not necessarily. Across our inspection records, 391.43H resulted in an out-of-service placement in 19.2% of cases—significantly lower than the 31.4% average across all FMCSR codes. Of the 26 all-time citations in our database, 5 drivers were placed out of service and 21 were not. Your specific outcome depends on the inspector's findings and whether other violations are present during the same inspection.

391.43H addresses improper medical examiner's certificate forms. Inspectors cite this when your medical certificate documentation—the paperwork proving you passed your DOT physical—is missing, incomplete, or filled out incorrectly. The form itself must meet specific FMCSA formatting and content standards. Even if you passed your physical, paperwork errors can trigger this violation.

Driver Fitness violations like 391.43H affect both you and your carrier on the FMCSA Safety Management System. Violations in this category roll into your Unsafe Driving and Driver Fitness BASICs, which factor into your Compliance, Safety, and Accountability scores. Both individual drivers and motor carriers see the impact, so addressing it quickly protects your hiring record and your company's safety rating.

Immediate steps:

1. Obtain a corrected medical certificate form. Contact your medical examiner and request the proper FMCSA form if there were errors.
2. File the corrected certificate with your state DMV immediately—this halts the citation's impact.
3. Check for co-violations. Our data shows 391.43H frequently appears with proof-of-inspection issues (396.17C) and equipment defects (393.9, 393.95B). If cited alongside these, address all of them.
4. Notify your carrier/employer within 24 hours.
5. Keep documentation of the correction for your records and any future audits.

391.43H is far less severe than broader medical certificate violations. Operating a property-carrying vehicle without a valid medical certificate (391.41APC) triggers a 97.1% out-of-service rate across 49,539 citations. General physical qualification violations (391.41(a)) sit at 16.2% OOS. At 19.2%, 391.43H—a paperwork issue—lands between these, but it's usually fixable without vehicle downtime if you already have a valid medical certification.

In the last 180 days, our records show Texas leads with 5 citations and an 80.0% out-of-service rate, followed by Illinois with 1 citation (100% OOS rate) and North Carolina with 1 citation (0% OOS rate). Texas accounts for the majority of 391.43H enforcement activity. If you operate in Texas, ensure your medical certificate form is filled out to exact FMCSA specifications—inspectors there are citing this violation more frequently.

Over the last 12 months, we've recorded 20 citations for 391.43H, compared to 26 all-time. The 90-day count is only 3 citations. However, the trend is volatile: July 2025 saw 5 citations in a single month, while most other months averaged 1–2. Recent months (November 2025 through March 2026) show a spike in out-of-service placements when the violation does occur, suggesting inspectors are stricter about enforcement or finding more serious paperwork gaps.

Yes. 391.43H is a documentation-based violation, which means it's contestable if the citation was issued in error or your records show the form was actually correct. File a Request for Data Review (RDR) through the FMCSA's DataQs system within 90 days of the citation. You'll need to submit proof of the proper form on file, a copy of your DOT medical certificate, and documentation of when it was filed with your state. Success depends on having clear evidence the paperwork was in order.