The Medical Card, and Why a Licencia Federal Counts

A note inside 49 CFR 391.41 recognizes the Mexican Licencia Federal as proof of medical fitness, so those drivers need no medical card. The condition nobody quotes is that the status must be electronically verifiable.

The Medical Card, and Why a Licencia Federal Counts

There is a paragraph in the federal rules written for Mexican drivers, and most of them have never read it. It is not a border policy and it is not a courtesy. It sits inside 49 CFR 391.41, the section that decides whether a driver is physically qualified to operate a commercial vehicle at all.

The main rule is the one everybody knows. A person must not operate a commercial motor vehicle unless he or she is medically certified as physically qualified, and when on duty must carry the original or a copy of a current medical examiner's certificate. The card. The thing you dig out of the door pocket when someone asks.

The note that changes it

Attached to that same paragraph is a note, and it is regulation text, not commentary. Effective December 29, 1991, and as amended on January 19, 2017, the FMCSA Administrator determined that the Licencia Federal de Conductor issued by the United Mexican States is recognized as proof of medical fitness to drive a CMV. A separate reciprocity agreement, effective March 30, 1999, does the same for a Canadian commercial driver's license.

The consequence is written plainly: Canadian and Mexican CMV drivers are not required to have a medical examiner's certificate in their possession.

The condition nobody quotes

That sentence does not stop there, and the second half is where drivers get caught. The exemption applies if the driver has been issued, and possesses, a valid commercial driver license from the United Mexican States or a Canadian province or territory, and whose license and medical status — including any waiver or exemption — can be electronically verified.

Electronically verifiable is doing the work in that sentence. It is not enough that the licence exists in your pocket. The status behind it has to be checkable.

And there is a hard limit right after it. A driver from any of those countries who received a medical authorization that deviates from the mutually accepted compatible medical standards of the resident country is not qualified to drive a commercial vehicle in the other country. The rule gives its own example: a Canadian driver who does not meet Canada's medical fitness provisions but was issued a provincial waiver is not qualified to drive in the United States. It runs the other way too — a U.S. driver operating on an FMCSA exemption or waiver is not qualified to drive in Canada.

What changed for U.S. CDL holders in 2025

There is a second exception in the same section, and it is newer. On or after June 23, 2025, a driver required to hold a commercial driver's license or commercial learner's permit, who has a current medical examiner's certificate documenting that he or she meets the physical qualification requirements, no longer needs to carry that certificate on his or her person.

One detail from that paragraph is worth memorizing. If the medical certification information provided electronically by FMCSA conflicts with a paper copy of the certificate, the electronic information controls. The paper in your wallet does not win an argument against the record.

And one exception survives all of this: a driver who qualifies by way of a medical variance from FMCSA — an exemption letter or a skill performance evaluation certificate — must still carry that variance documentation while on duty. That one you keep on you.

What the physical standard actually measures

Paragraph (b) is the list the examiner works from, and the vision standard is the one that surprises people. Distant visual acuity of at least 20/40 in each eye, with or without corrective lenses; distant binocular acuity of at least 20/40; a field of vision of at least 70 degrees in the horizontal meridian in each eye; and the ability to recognize the colors of traffic signals — standard red, green and amber.

What to do with this

  • Know which document is doing the work. The Licencia Federal substitutes for the medical card, not for the commercial licence.
  • Assume the verification, do not assume the officer. The exemption depends on your status being electronically verifiable, so a licence in good standing matters more than a card in the visor.
  • Carry variance paperwork. An exemption letter or SPE certificate is still a document you keep on your person.
  • Do not travel on a waiver from the other side. A medical authorization that departs from your own country's standard does not cross.
  • If the record and the paper disagree, the record wins. Fix the record.

Maintenance keeps a truck legal; paperwork keeps the driver legal, and the second one is cheaper to get right. Shop guides and operator resources are at thetrucksavers.com, and compliance coverage continues here at Truck Savers News. Want the rules before they meet you at a scale? Get the weekly TSN newsletter.

Original source

Requirements verified directly against the regulation in force: eCFR, 49 CFR 391.41, Physical qualifications for drivers.