UnitedHealth Group Inc.'s top executive this week will defend his company’s response to a cyberattack that held up payments across the US health care system, testifying before Congress as lawmakers push for new industry cybersecurity standards and more scrutiny of consolidation among insurers.
Chief Executive Officer Andrew Witty is set to appear Wednesday before the Senate Finance and the House Energy and Commerce committees. The heads of those panels want to know whether the hack of Change Healthcare, a provider of billing and data management for