Another major computer breach involving UnitedHealth Group has prompted two U.S. senators this week to query the health care giant about the adequacy of its cyber defenses.

Episource, a UnitedHealth subsidiary, had its systems hacked last winter, exposing the data of 5.4 million people.

The cyberattack appears to be the second-largest U.S. health care hack this year and follows a record-breaking breach in February 2024 of another United subsidiary, Change Healthcare.

The Change cyberattack is regarded as the largest ever U.S. health care hack. It affected the data of 190 million people - about half the country's population.

"The recently reported hack of Episource, a subsidiary of UnitedHealth Group (UHG), raises significant questions about UHG's efforts to safeguard patient informat

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