The hackers targeted a hospital network named Community health Systems.
It operates more than 200 hospitals in 29 states.
The Mountain West Medical Center in Tooele and the Evanston Regional Hospital in Wyoming are part of the network.
The breach happened sometime in April and June this year and the hackers got patients' names, social security numbers, addresses and phone numbers.
If you've been in one of those hospitals keep a close watch on your bank accounts.
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