The big announcement was made on Wednesday, and many of the details are still being worked out ahead of the planned 2028 split of the company. For now, the plan is for CVS Health to retain its core Caremark and Aetna businesses, with the pharmacy company to take over prescription drug sales and urgent care services.

The data comes from the Commonwealth Fund. The group’s annual survey found that uninsured rates among all working-aged adults in the U.S. are rising, now standing at 11%—a number expected to go up as Medicaid work requirements go into effect.

Many details, including the number of victims and the method hackers used to perform the data breach, are unknown. The company said the incident is still being investigated with the help of law enforcement. 

Americans were split along party lines, but broadly speaking, federal healthcare agencies are historically unpopular, based on data going back as far as 2003.