Data Breaches Millions Impacted Across Several US Healthcare Data Breaches Several healthcare data breaches impacting hundreds of thousands and even millions were added to the HHS tracker. By Eduard Kovacs | May 18, 2026 (8:58 AM ET) Flipboard Reddit Whatsapp Whatsapp Email Several major data breaches were added to the healthcare data breach tracker maintained by the US Department of Health and Human Services (HHS) in recent days. All of the breaches were disclosed in recent months, but the number of affected individuals has only been made public now on the HHS breach tracker . The largest incident affects the New York City Health and Hospitals Corporation, which in March disclosed a data breach detected on February 2, 2026. An investigation found that threat actors had access to its systems between November 2025 and February 2026 via a third-party vendor. Exposed information includes personal, health insurance, medical, biometric, and financial information. According to the HHS tracker, the NYC Health and Hospitals data breach affects 1.8 million individuals. Erie Family Health Centers in Chicago, Illinois, detected a hacker attack in January. A probe showed that hackers had access to its network between December 10, 2025, and late January 2026. Advertisement. Scroll to continue reading. Compromised information, the healthcare organization said in a data incident notice , includes names, phone numbers, email addresses, SSNs, driver’s license numbers, passport numbers, online account credentials, financial information, and medical information. The HHS tracker shows that the Erie breach has affected 570,000 individuals. A breach at Florida Physician Specialists reportedly affects 276,000. The organization said in an incident notice on its website that hackers had access to its network for two days in November 2025, gaining access to information such as names, SSNs, driver’s license numbers, financial information, and medical information. Coastal Carolina Health Care in North Carolina and Western Orthopaedics in Colorado each reported data breaches impacting roughly 110,000 people. The former said it detected the intrusion more than one year ago. A breach at Nacogdoches Memorial Hospital in Texas affects 2.5 million individuals, according to the HHS tracker. However, it was previously reported that 250,000 individuals were affected, suggesting a possible typo in the figure. The other figures may be updated as well. Last week, a small dermatology clinic in Arizona was reported to have suffered a data breach affecting 3 million people. The number was later updated in the HHS tracker to 500. None of these healthcare data breaches appears to have been claimed by known cybercrime groups. Related : 7-Eleven Data Breach Confirmed After ShinyHunters Ransom Demand Related : Grafana Confirms Breach After Hackers Claim They Stole Data Related : 716,000 Impacted by OpenLoop Health Data Breach Written By Eduard Kovacs Eduard Kovacs (@EduardKovacs) is senior managing editor at SecurityWeek. He worked as a high school IT teacher before starting a career in journalism in 2011. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering. 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