Erin Allday writes in the San Francisco Chronicle, “The city of San Francisco is challenging state legislation that allows insurance companies to charge women more than men for health coverage. In a practice known as gender rating, women in California pay up to 39 percent more than men for coverage in the individual insurance market, which is where people who aren’t covered by employer plans or state health programs get their insurance. Nationwide, about 7 percent of women buy their health coverage directly from insurance companies.”