Qualifying for medical marijuana requires three things: living in (or visiting) a state with a medical cannabis program, having a diagnosed condition on that state’s approved list, and getting a written certification from a licensed physician. Nearly every U.S. state now has some form of medical cannabis law on the books. As of early 2024, 47 states, Washington D.C., and three U.S. territories allow cannabis for medical purposes, with 38 states plus D.C. operating comprehensive programs that include dispensaries and patient registries.
The specifics vary significantly from state to state, though. Your qualifying condition in one state might not qualify you in another, and holding a valid card doesn’t protect you from federal consequences in certain situations. Here’s what you need to know about eligibility, the certification process, and the restrictions that come with it.
Conditions That Qualify in Most States
Every state maintains its own list of qualifying medical conditions, but certain diagnoses appear on nearly all of them. Chronic pain is the most common qualifying condition nationwide, and it’s also the reason most patients seek a card. States typically define this as pain that has persisted despite conventional treatments, or pain for which opioids and other standard therapies are ineffective or inappropriate. You don’t usually need to meet a specific duration threshold, but you do need documented evidence that other approaches haven’t worked.
Cancer appears on virtually every state’s list, both for the disease itself and for symptoms like severe weight loss, nausea from chemotherapy, and treatment-related pain. Epilepsy and seizure disorders are similarly universal, as are multiple sclerosis, Crohn’s disease, and HIV/AIDS.
PTSD is now accepted in almost every medical cannabis program in the country. New Mexico became the first state to specifically list it as a qualifying condition in 2009, and since then the trend has been overwhelming. All but two state programs (Alaska and South Dakota) now allow medical cannabis for PTSD, with 32 states listing it by name in their statutes and several others giving physicians broad authority to recommend cannabis for any serious condition. A study of 80 patients using cannabis for PTSD in New Mexico found greater than 75% reduction in symptom scores when patients were using cannabis compared to when they were not.
Beyond these common conditions, many states also include ALS, Parkinson’s disease, glaucoma, terminal illness, and severe or persistent muscle spasms. Some states take a more flexible approach, allowing any physician to certify a patient for a condition not on the official list if they believe cannabis would provide therapeutic benefit. Others are strict about the list and won’t approve conditions that aren’t explicitly named.
What the Certification Process Looks Like
You can’t simply walk into a dispensary with a diagnosis. Every state requires a written certification from a licensed physician (or in some states, a nurse practitioner or physician assistant) before you can apply for a medical cannabis card. This certification is not a prescription. Because cannabis remains a Schedule I substance under federal law, doctors cannot technically prescribe it. Instead, they certify that you have a qualifying condition and that cannabis may provide therapeutic or palliative benefit.
The physician must establish what’s called a “bona fide physician-patient relationship” with you. This means more than a five-minute video call. The doctor needs to review your relevant medical records, complete a full assessment of your medical history and current condition, create and maintain records according to accepted medical standards, and have a reasonable expectation of providing follow-up care to monitor how well cannabis works for you. If you give permission, they should also notify your primary care physician about your certification.
Once you have the written certification, your application to the state typically includes the practitioner’s name and contact information, identification of your diagnosed qualifying condition, and the practitioner’s attestation that they’ve reviewed your prescription history, discussed possible risks and drug interactions with you, and confirmed the diagnosis. Some states, like Kentucky, require the certifying practitioner to pull your prescription monitoring data from the previous 12 months before signing off.
Patients Under 18
Minors can qualify for medical marijuana in most states with comprehensive programs, but the requirements are stricter. A parent or legal guardian must serve as the patient’s legal representative throughout the process, consenting to treatment and often applying in person alongside the minor. In states like Kentucky, a minor patient needs documentation of their qualifying condition from two separate practitioners: the one issuing the cannabis certification and an independent physician confirming the diagnosis. Minors who don’t have a government-issued photo ID can typically use a certified birth certificate, and proof of residency can come from the parent or guardian’s records rather than the child’s own name.
Using Your Card in Another State
Some states honor out-of-state medical marijuana cards, a system known as reciprocity. The rules differ by state, and not all programs participate. Arkansas, for example, allows visiting patients to apply for a temporary card by submitting their home state’s medical marijuana card and paying a $50 processing fee. If approved, the visiting patient can purchase medical cannabis in Arkansas for 90 days. One important catch: the condition that qualified you in your home state must also be a qualifying condition in the state you’re visiting. If it isn’t, you won’t be approved.
States that offer reciprocity typically issue short-term cards and may limit the amount you can purchase. Others don’t recognize out-of-state cards at all, meaning you’d have no legal way to obtain cannabis there even with a valid card from home. Before traveling, check the specific rules in your destination state.
Federal Restrictions That Still Apply
A state-issued medical marijuana card does not override federal law, and this creates real consequences in specific situations.
Federal employees cannot use marijuana regardless of their state’s laws. The U.S. Forest Service, for instance, has stated plainly that all federal employees are required to remain drug-free and refrain from federally prohibited drug use whether on or off duty. This applies across every federal agency. Holding a valid medical card in your state offers no protection if your employer is the federal government. The same is true for many government contractors and anyone holding a commercial driver’s license, which falls under federal Department of Transportation regulations.
Firearms are another area where federal and state law collide sharply. Under federal law, any person who is an unlawful user of a controlled substance is prohibited from shipping, transporting, receiving, or possessing firearms or ammunition. Because marijuana remains a Schedule I controlled substance with no federal medical exception, medical marijuana patients are legally barred from purchasing or possessing guns under federal law. The Bureau of Alcohol, Tobacco, Firearms and Explosives has issued guidance stating that firearms dealers who are aware a customer holds a medical marijuana card have “reasonable cause to believe” that person is an unlawful user and may not transfer a firearm to them, even if the customer answers “no” on the relevant question of the purchase form.
Who Doesn’t Qualify
Even in states with broad medical cannabis programs, certain people won’t be eligible. If your condition isn’t on your state’s qualifying list and your state doesn’t offer physician discretion for unlisted conditions, you won’t be approved. Patients who can’t establish a genuine physician-patient relationship, such as those seeking a certification from a doctor who hasn’t reviewed their records or conducted a proper evaluation, will also be denied in states that enforce their standards.
People in the three remaining states without any form of medical cannabis law have no legal pathway. And in states with limited programs (sometimes called “CBD-only” laws), only patients with a narrow set of conditions, often just severe epilepsy, qualify for low-THC cannabis products rather than full-spectrum medical marijuana.
If you’re unsure whether your state’s program covers your condition, your state health department’s medical cannabis page will have the current qualifying conditions list. These lists do change over time as states add new conditions, so a diagnosis that didn’t qualify a few years ago may qualify now.