LOS ANGELES -- When Maria Barrales' children got sick, she would drive two hours south from her East Los Angeles home to the Mexican border and spend two more hours waiting to cross so she could go to an affordable doctor in Tijuana.Now, Barrales, who does not have health insurance, can walk a couple of blocks to Garfield High School and see a modestly priced physician at a new health clinic converted from an auto shop on the school grounds.The clinic is one of 14 new "wellness centers" that the Los Angeles Unified School District is rolling out this year at schools in impoverished neighborhoods in an initiative that expands the mission of traditional school-based health centers from treating only students into one that treats the general public, too.While a smattering of school clinics across the nation have long been open to the public, more are looking to expand their patient base to reap revenue that can subsidize the care often given for free to youngsters as well as fill a dire larger need for community healthcare access."The more folks you're seeing, the more revenue you're generating," said Tracey Schear, who oversees 26 school-based health centers for Alameda County Health Services Agency in Northern California. "We're trying to make more visits reimbursable."About 1,800 school-based centers, which are usually run by a nonprofit or public healthcare provider in school-owned buildings, operate across the country. They provide a combination of primary care, mental health counseling, dental and vision screenings, and health education and prevention to youth who may have grown up with few, if any, doctor visits.Around since the 1980s, school health clinics received a shot in the arm from the federal Affordable Care Act, which earmarked $200 million from 2010 to 2013 to build and equip more centers and expand services. With fewer than half of public schools now employing school nurses, some districts have used the money to add health centers in schools, including mental health, vision and dental care.The federal funding, though, does not cover operational expenses, and more providers are looking to become financially sustainable in an era of shrinking public money and increasing competition for private donations that typically fund school clinics. Some clinics have closed in recent years.