Emergency departments on diversion and not accepting patients are Hamilton, Greene Memorial, Huber, Middletown, Preble, Springfield and Franklin.
Issues started around 7:45 a.m.
The problem is believed to be the result of an internal IT issue, and phone systems are operational, the posting said.
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Between April and May, Kettering Health was the target of a cyberattack that resulted in canceled appointments, delayed medical treatments and an inability for patients to call their care teams or access the health care system’s online patient portal, MyChart.
Kettering Health administrators were not available for comment.
Kettering Health has 14 area medical centers and more than 120 outpatient locations throughout Western Ohio, as well as the Kettering Physician Network, which includes more than 700 board-certified providers.