WASHINGTON -- March 31, 2009 -- CONGRESS-HEALTH-INSURANCE-3 -- From left, Stephen J. Hemsley, the chief executive of UnitedHealth Group, and Andy M. Slavitt, who heads UnitedHealthi 1 2s database business, Ingenix, appear before the Senate commerce committee in Washington on Tuesday, March 31, 2009. The panel is weighing evidence that health insurers had routinely underpaid their customers for out-of-network medical care.