Over five million patients' social security numbers and personal information were compromised in a major healthcare cyber breach. According to the Daily Mail, hackers accessed this sensitive information at Yale New Haven Health (YNHHS).
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Over 5 Million Healthcare Patients Affected By Medical Data Breach
The YNHHS first noticed strange activity linked to the data breach on March 8. Only on April 11 did they confirm that hackers stole this sensitive medical data. The YNHHS works throughout 360 locations across Connecticut, New York, and Rhode Island. This organization is a nonprofit healthcare system and remains the largest healthcare system in Connecticut.
The stolen information included social security numbers, patient types, and medical record numbers. On the bright side, the YNHHS confirmed that the hackers didn't steal financial or payment information. The organization also said that electronic medical records and treatment information were safe.
This was revealed three days later on April 14 when impacted patients received letters on the data breach incident. The YNHHS wrote that they found no evidence of "any patient information being used for identity theft or fraud."
With a total of 5,556,702 patients impacted by this cyber attack, this has been the largest healthcare data breach in 2025. "Our investigation has now determined that an unauthorized third-party gained access to our network and, on March 8, 2025, obtained copies of certain data," the organization said on April 11.
Social Security Numbers And Other Data Stolen In Medical Cyber Attack
"The information involved varies by patient, but may include demographic information (such as name, date of birth, address, telephone number, email address, race or ethnicity), Social Security number, patient type, and/or medical record number."
For any patient affected by this terrible cyber breach, the YNHHS recommended that patients "review statements they receive from their healthcare providers and immediately report any inaccuracies to the provider."
If you believe this data breach may have affected you, make sure to check for any letters from the YNHHS. "We have begun the process of mailing letters to patients whose information was involved in this incident," they said.
Within those letters, the YNHHS provided resources to help affected patients. These resources include "complimentary credit monitoring and identity protection services."
