The Prospect Medical Holdings system, which operates 16 hospitals and more than 165 health centers and outpatient clinics in Connecticut, Pennsylvania, Rhode Island and Southern California, announced Thursday that it had been hit by a cyberattack.
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A spokesman for Prospect Medical Center could not estimate Saturday when services would return to normal. It was not immediately clear how many of the system's centers were affected.
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The website of Eastern Connecticut Health Network, a partner of Prospect Medical, lists locations that will remain closed until further notice, including a medical imaging center, an urgent care center and an outpatient blood center, among others.
CharterCARE Health Partners, a Rhode Island affiliate, announced on Facebook Thursday that it had to reassign some of its appointments and revert to using handwritten records. According to the Philadelphia Inquirer, computers were also down at Crozer Health’s facility in Delaware County.
“Prospect Medical Holdings, Inc. recently experienced a data security that disrupted operations ,” the company said in a statement Saturday. “Upon becoming aware of this, we took our systems offline to protect them and initiated an investigation with the assistance of third-party cybersecurity experts.”
The company said it is focused on addressing the urgent needs of its patients while working with determination to return to normal operations as quickly as possible.
It did not provide details about the nature of the security breach.

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Waterbury Hospital in Waterbury, Connecticut , said Saturday it was still experiencing disruptions . It also said some of its imaging and outpatient services were unavailable Friday and Saturday. On Thursday, it said it was relying on handwritten, archived files.
Cyberattacks on hospitals have become more common, according to John Riggi, national advisor for cybersecurity and risk at the American Hospital Association.
Source of information: nytimes.com
