UnitedHealth Group's subsidiary, Change Healthcare, was hit by a ransomware attack by BlackCat, leading to the theft of significant private health care data.

A $22 million ransom was paid to BlackCat to protect customer data, indicating the severity of the data breach.

The breach's full impact is still under assessment, but files with protected health information and personally identifiable information were compromised.

UnitedHealth has not yet notified impacted customers, but hackers have released 22 screenshots of stolen files on the dark web.

Recovery efforts show progress, with most pharmacy claim processing and payment capacities nearing full restoration.

UnitedHealth Group is implementing support measures, including two years of free credit monitoring and identity theft protection for those affected.

The incident has sparked calls for stronger data protection and has garnered attention from lawmakers, with CEO Andrew Witty set to testify before Congress.

Despite the breach, UnitedHealth Group reported better-than-expected revenue for the quarter, though its stock price dipped following the news.