Health-care reform is about more than covering more Americans and controlling costs. It’s also about quality. Repairing health care requires “delivery-system reform” — moving away from inefficient and inconsistent care and toward more coordinated, value-driven medicine. But it’s hard to get doctors enthused about adopting a “less is more” approach if they fear lawsuits from patients who think less is simply less and believe they have an inalienable right to more and more. More CT scans. More back surgeries. Even more colonoscopies. Overtreatment has many causes — the idiosyncrasies of a physician’s training, local practice patterns, the doctor’s bottom line. But many experts believe that limiting “defensive” medicine, which is notoriously hard to quantify, would at least remove one barrier to fixing the broken system. Economists may believe that “defensive medicine” is less of a problem than doctors do. But it’s the doctors that have to accept the new care models —and get their patients to follow.