The HealthTech Signal

Health Data Breach Tracker/Monthly roundup

Biggest health data breaches: April 2025

In April 2025, 76 health data breaches affecting 500 or more people were reported to the HHS Office for Civil Rights, with a combined 13,924,614 individuals affected as reported. Hacking/IT Incident was the most common breach type this month, and healthcare provider accounted for the most reports. Counts are as reported to OCR and may overlap across breaches; a listing does not imply wrongdoing.

Breaches reported

76

Individuals affected

13,924,614

Hacking or IT incidents

58

  1. 1Yale New Haven Health SystemCT · Healthcare Provider · Hacking/IT Incident · Apr 11, 20255,556,702
  2. 2Blue Shield of CaliforniaCA · Business Associate · Unauthorized Access/Disclosure · Apr 9, 20254,700,000
  3. 3Kelly & Associates Insurance Group, Inc.MD · Business Associate · Hacking/IT Incident · Apr 9, 2025553,332
  4. 4Ascension HealthMO · Healthcare Provider · Hacking/IT Incident · Apr 28, 2025437,329
  5. 5Onsite MammographyMA · Business Associate · Hacking/IT Incident · Apr 21, 2025357,265
  6. 6Union Health System, Inc.IN · Healthcare Provider · Hacking/IT Incident · Apr 21, 2025262,831
  7. 7The City of Long Beach, CACA · Healthcare Provider · Hacking/IT Incident · Apr 14, 2025258,191
  8. 8Bell Ambulance, Inc.WI · Healthcare Provider · Hacking/IT Incident · Apr 14, 2025237,830
  9. 9Dameron HospitalCA · Healthcare Provider · Hacking/IT Incident · Apr 2, 2025210,706
  10. 10Central Texas Pediatric OrthopedicsTX · Healthcare Provider · Hacking/IT Incident · Apr 4, 2025140,000
  11. 11Alabama Ophthalmology AssociatesAL · Healthcare Provider · Hacking/IT Incident · Apr 8, 2025131,576
  12. 12Endue SoftwareME · Business Associate · Hacking/IT Incident · Apr 11, 2025118,028
  13. 13Alternate Solutions Health Network, LLCOH · Healthcare Provider · Hacking/IT Incident · Apr 14, 202593,589
  14. 14Health Services LLCOH · Healthcare Provider · Hacking/IT Incident · Apr 1, 202575,906
  15. 15Cardiology Associates of FredericksburgVA · Healthcare Provider · Hacking/IT Incident · Apr 17, 202575,476
  16. 16Whitman County Public Hospital District No. 3WA · Healthcare Provider · Hacking/IT Incident · Apr 11, 202563,453
  17. 17Central District Health Department of NebraskaNE · Healthcare Provider · Hacking/IT Incident · Apr 1, 202558,519
  18. 18Horizon Behavioral HealthVA · Healthcare Provider · Hacking/IT Incident · Apr 21, 202549,303
  19. 19Family Christian Health CenterIL · Healthcare Provider · Hacking/IT Incident · Apr 30, 202548,151
  20. 20Palo Verde HospitalCA · Healthcare Provider · Hacking/IT Incident · Apr 24, 202542,962
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