Kris Tripplaar/Sipa USA Centene Corp. criticized the Ohio attorney general for lacking a "basic understanding" of the state's $26 billion Medicaid program, claiming he wasted taxpayer time and money accusing Centene of overcharging the state by millions in drug costs. "There are no secrets here; there is nothing that needs to be hidden or, in fact, that even justifies the filing of this lawsuit," Centene wrote in a federal court filing in Ohio on Friday. In March, Ohio Attorney General Dave Yost sued Centene, alleging its Buckeye Health Plan subsidiary used a "web of subcontractors" to obscure drug costs and fleece the state's Medicaid program out of millions of dollars in pharmacy benefits. The suit was filed in the Franklin County Court of Common Pleas and is sealed.