A new JAMA Pediatrics study introduced the nation’s first pediatric acute care atlas, mapping hospital service and referral regions across the U.S. using more than 28 million encounters to improve research, policy, and health system planning. John Graves, PhD, of Vanderbilt University Medical Center, said the atlas provides a powerful, data driven foundation for better understanding how children access acute care and for informing strategy, performance measurement, and policymaking nationwide.