UnitedHealth's CEO, Andrew Witty, stated that the company is still investigating the security failure that led to a massive cyberattack.
The breach occurred when intruders accessed a server without multifactor authentication.
UnitedHealth is facing accusations of failing to establish basic security protocols and recover from the breach.
The cyberattack could cost UnitedHealth up to $1.6 billion, and a bill has been introduced to incentivize minimum cybersecurity standards in the healthcare industry.