In oral arguments on Tuesday, the justices of the Colorado Supreme Court grappled with questions about hospital price transparency in a case that shines a spotlight on the “chargemaster” — an obscure and seemingly inscrutable character in the drama of America’s healthcare affordability crisis. At the heart of the case is a billing dispute between Lisa French and St. Anthony North Health Campus north of Denver, which is run by Centura Health. French had elective spinal fusion surgery at the hospital in 2014. Before the surgery, the hospital gave French an estimate for the procedures stating she would likely owe...