How to Change Your CDL from Intrastate to Interstate

To change your CDL from intrastate to interstate, you need to remove the “K” restriction on your license by passing a DOT physical from a federally certified medical examiner, updating your self-certification category to Non-Excepted Interstate with your state licensing agency, and clearing a check against the FMCSA’s Drug and Alcohol Clearinghouse. For most drivers who already have their paperwork lined up, it’s a single trip to the state licensing office.

What the K Restriction Actually Does

Every CDL limited to a single state carries a “K” restriction code, which stands for “Intrastate only.”¹ It’s printed on the face of the license alongside any other codes. Removing it does not change your CDL class or endorsements; the same license becomes valid for interstate commerce.

Driving across state lines with a K-restricted CDL is a federal violation and can trigger disqualification. Motor carriers running interstate routes also cannot legally dispatch a driver whose license still shows the restriction, so the change has to happen before your first interstate load, not after.

Who Can Make the Switch

You must be at least 21 years old to operate a commercial motor vehicle in interstate commerce.² The K restriction exists in the first place because many states issue CDLs at 18 for in-state work. The FMCSA’s Safe Driver Apprenticeship Pilot, which had temporarily allowed some 18-to-20-year-old drivers to run interstate under supervision, concluded in November 2025, so there is no federal pathway for under-21 drivers in 2026.³

You also have to hold your CDL from the state where you live. Federal law allows one CDL per person, issued by your state of domicile. If you’ve moved since your CDL was issued, transfer your license to your new state first, or handle the transfer and the restriction removal in the same visit.⁴

Your record has to be clear of any active federal disqualification. Major offenses like a DUI conviction, refusing a drug or alcohol test, or leaving the scene of an accident carry a one-year disqualification, and a second major offense results in a lifetime bar. Serious traffic violations stack too: two within three years bring a 60-day disqualification, three within the same window bring 120 days.⁵ If you’re currently serving a disqualification, the state won’t process the upgrade until it ends.

Pass a DOT Physical From an NRCME Examiner

Interstate CDL holders must carry a valid Medical Examiner’s Certificate issued by a provider listed on the FMCSA’s National Registry of Certified Medical Examiners.⁶ If your current intrastate medical card came from a provider who isn’t on the National Registry, it won’t satisfy the federal standard, so you’ll need a fresh exam.

Federal physical standards require at least 20/40 vision in each eye with or without correction, the ability to perceive a forced whisper at five feet, no current diagnosis of conditions likely to cause loss of consciousness, and no uncontrolled high blood pressure.⁷ When you pass, the examiner issues Form MCSA-5876, valid for up to 24 months.⁶ Certain conditions, such as insulin-treated diabetes or blood pressure controlled by medication, may shorten the certificate to 12 months or less.

If You Have a Disqualifying Condition

Some conditions that would otherwise block interstate driving can be worked around through federal exemption programs. Drivers with insulin-treated diabetes can apply for the FMCSA’s diabetes exemption, which requires an endocrinologist evaluation and a vision exam, both valid for only six months from the date performed.⁸ Drivers with a missing or impaired limb can apply for a Skill Performance Evaluation certificate, which involves demonstrating safe operation of the specific type of truck.⁹ Both processes can take several months, so start early.

Clear the Drug and Alcohol Clearinghouse

This is the step that catches drivers off guard. Before the state can remove the K restriction, it has to query the FMCSA’s Drug and Alcohol Clearinghouse to confirm you are not in “prohibited” status.¹⁰ The database tracks drug and alcohol violations reported by employers and testing labs.

A “prohibited” status stops the transaction cold. Since November 2024, state agencies have been required to remove commercial driving privileges entirely from drivers in prohibited status, not just block new transactions.¹¹ Clearing it requires completing the return-to-duty process: evaluation by a substance abuse professional, any recommended treatment, and a passing return-to-duty test. Only after your record shows “not prohibited” can the state process the upgrade.

The state runs the query automatically, so there’s nothing extra to file. If you suspect a violation might be on your record, from a prior employer’s random test for instance, create a free Clearinghouse account and check it yourself before heading to the licensing office.

Change Your Self-Certification Category

Every CDL holder must certify which of four categories of commerce they operate in.¹² To go interstate, you change your self-certification to “Non-Excepted Interstate,” which is the category for drivers who cross state lines and are subject to federal physical qualification standards.¹³

A narrow “Excepted Interstate” category covers a short list of activities like transporting school children, driving certain government vehicles, or hauling farm supplies within 150 air-miles of a farm, and drivers in that category do not need a federal medical certificate. If any of your work falls outside that list, or if you’ll mix excepted and non-excepted driving, Non-Excepted Interstate is the correct choice.¹³

Documents to Bring

The exact list depends on your state, but expect to bring:

Your current CDL.
Your Medical Examiner’s Certificate, Form MCSA-5876. Some states now receive it electronically from the National Registry, but bring the paper copy anyway.
Proof of identity, such as a birth certificate with a raised seal or a valid U.S. passport.
Social Security verification, either your card or a W-2 showing your full name and number.
Two documents proving your current address, such as utility bills, a lease, or bank statements.

Non-U.S. citizens will also need proof of lawful permanent residency or other qualifying immigration status. Check your state’s licensing agency page for the exact list before your visit.⁴

At the Licensing Office

With documents in hand, you’ll complete a change-of-status application, submit your medical certificate if it isn’t already on file electronically, update your self-certification to Non-Excepted Interstate, pay the fee, and have a new photo taken.

Fees vary widely. Some states charge as little as $11 for a restriction removal, others charge over $100 by classifying the change as a new issuance, and a few exceed $150. Ask your state licensing agency for the current amount rather than relying on figures published online.

Most states do not make you retake the CDL knowledge or skills tests to remove the K restriction, because you already hold a valid CDL in the same class. FMCSA’s entry-level driver training requirements also generally do not apply to restriction removals.¹⁴ A handful of states may require a short knowledge test on interstate-specific regulations, so ask when you schedule your appointment.

Most states issue a temporary paper license on the spot. The permanent card without the K restriction arrives by mail within a few weeks. Before your first interstate load, confirm with your carrier that your updated status appears correctly in FMCSA’s systems.

If You Have a Hazmat Endorsement

If your intrastate CDL carries a hazardous materials (H or X) endorsement and you want to keep it on the interstate license, give yourself extra lead time. TSA runs a separate security threat assessment for every hazmat endorsement, including when a driver changes CDL status. It involves fingerprinting and a background check, and TSA recommends starting at least 60 days before you need the determination.¹⁵

As of January 2025, the hazmat threat assessment fee is $85.25. Depending on your state, you may apply and provide fingerprints online, at a designated enrollment center, or at your local DMV office. Drivers in Florida, Kentucky, Maryland, New York, Pennsylvania, Texas, Virginia, and Wisconsin must apply through the state DMV rather than TSA’s general enrollment centers.¹⁵

Keep Your Medical Certificate Current

Once you’re interstate, a lapsed medical certificate is a serious problem. If yours expires and you don’t submit a new one or change your self-certification category, the state must begin a downgrade, which has to be completed within 60 days of your medical status changing to “not-certified.”¹⁶ A downgrade removes your commercial driving privileges from the license entirely, not just the interstate piece. Getting the CDL back means going through reinstatement, which in some states involves retesting. Schedule your next DOT physical before your current certificate expires. Thirty days out is a reasonable reminder.

1
eCFR. 49 CFR 383.153 – Information on the CLP and CDL Documents and Applications
2
eCFR. 49 CFR 391.11 – General Qualifications of Drivers
3
Federal Motor Carrier Safety Administration. Safe Driver Apprenticeship Pilot (SDAP) Program
4
Federal Motor Carrier Safety Administration. How Do I Get a Commercial Driver’s License?
5
eCFR. 49 CFR 383.51 – Disqualification of Drivers
6
Federal Motor Carrier Safety Administration. DOT Medical Exam and Commercial Motor Vehicle Certification
7
eCFR. 49 CFR 391.41 – Physical Qualifications for Drivers
8
Federal Motor Carrier Safety Administration. Diabetes Exemption Package
9
Federal Motor Carrier Safety Administration. Skill Performance Evaluation Certificate Program
10
Drug & Alcohol Clearinghouse. CDL Downgrades
11
Drug & Alcohol Clearinghouse. Drug and Alcohol Clearinghouse Home
12
eCFR. 49 CFR 383.71 – Driver Application and Certification Procedures
13
Federal Motor Carrier Safety Administration. How Do I Determine Which of the 4 Categories of Commercial Motor Vehicle (CMV) Operation I Should Self-Certify To?
14
Federal Motor Carrier Safety Administration. Training Provider Registry – Applicability and Exceptions
15
Transportation Security Administration. HAZMAT Endorsement
16
eCFR. 49 CFR 383.73 – State Procedures