Patients who use medical marijuana for pain and other chronic symptoms can take an unwanted hit: Insurers don't cover the treatment, which costs as much as $1,000 a month.
Once the drug of choice for hippies and rebellious teens, marijuana in recent years has gained more mainstream acceptance for its ability to boost appetite, dull pain and reduce seizures in everyone from epilepsy to cancer patients.
Still, insurers are reluctant to cover it, in part because of conflicting laws. While 21 U.S. states have passed laws approving it for medical use, the drug still is illegal federally and in most states.
But perhaps the biggest hurdle for insurers is the U.S. Food and Drug Administration hasn't approved it. Major insurers generally don't cover treatments that are not approved by the FDA, and that approval depends on big clinical studies that measure safety, effectiveness and side effects.