The Senate Finance Committee is planning to question UnitedHealth Group CEO Andrew Witty about a major cyberattack on its subsidiary Change Healthcare, which caused significant disruptions in the healthcare industry. The attack highlighted vulnerabilities in the system, leading to payment delays for providers and difficulties for patients in accessing medications. Lawmakers are expressing frustration over the incident and the perceived lack of adequate cybersecurity measures. The hearing, possibly set for April, will address these issues, along with UnitedHealth's response and future data protection plans. This scrutiny comes amidst broader concerns about the consolidation in the healthcare sector and its impact on market stability and data security.