350,000individuals
Hacking/IT IncidentArchived
The Signal Directory
Health Data Breach Tracker
Search every US health data breach of 500 or more people reported to HHS OCR since 2009. Filter by entity, type and date. Built from the OCR public breach portal.
Breaches listed
8,066
2009 to 2026
Individuals affected
1,106,146,271
sum of reported counts
Under investigation
open OCR cases
Top breach types
- 4,864
- 1,694
- 1,003
- 216
Monthly roundups
8,066 breaches
516individuals
Hacking/IT IncidentArchived
8,801individuals
Hacking/IT IncidentArchived
IN · Aug 10, 2023
Allison Transmission Inc. Health Care Program for Hourly Employees / Wellness Program for Salaried Employees
Business Associate
5,330individuals
Hacking/IT IncidentArchived
203,427individuals
Hacking/IT IncidentArchived
223,598individuals
Hacking/IT IncidentArchived
981individuals
Hacking/IT IncidentArchived
1,446individuals
Unauthorized Access/DisclosureArchived
520individuals
Unauthorized Access/DisclosureArchived
423,824individuals
Hacking/IT IncidentArchived
6,267individuals
Hacking/IT IncidentArchived
1,997individuals
Hacking/IT IncidentArchived
33,212individuals
Hacking/IT IncidentArchived
18,261individuals
Hacking/IT IncidentArchived
1,136individuals
Hacking/IT IncidentArchived
1,247individuals
Hacking/IT IncidentArchived
739,884individuals
Hacking/IT IncidentArchived
1,345individuals
Unauthorized Access/DisclosureArchived
3,400individuals
Hacking/IT IncidentArchived
987individuals
Unauthorized Access/DisclosureArchived
1,769individuals
Hacking/IT IncidentArchived
21,383individuals
Hacking/IT IncidentArchived
9,179,390individuals
Hacking/IT IncidentArchived
632,204individuals
Hacking/IT IncidentArchived
518individuals
Unauthorized Access/DisclosureArchived
5,058individuals
Hacking/IT IncidentArchived
7,313individuals
Hacking/IT IncidentArchived
559,315individuals
Hacking/IT IncidentArchived
4,790individuals
Hacking/IT IncidentArchived
798individuals
Unauthorized Access/DisclosureArchived
1,292individuals
Hacking/IT IncidentArchived
11,270,000individuals
Hacking/IT IncidentArchived
2,975individuals
Hacking/IT IncidentArchived
2,584individuals
Hacking/IT IncidentArchived
296,956individuals
Hacking/IT IncidentArchived
689,686individuals
Hacking/IT IncidentArchived
505individuals
Hacking/IT IncidentArchived
2,342,357individuals
Hacking/IT IncidentArchived
MN · Jul 28, 2023
Dean Health Service Company, LLC (referenced herein as "WellFirst Health")
Business Associate
1,027individuals
Hacking/IT IncidentArchived
2,430,920individuals
Hacking/IT IncidentArchived
53,827individuals
Hacking/IT IncidentArchived
545,491individuals
Hacking/IT IncidentArchived
3,201individuals
Hacking/IT IncidentArchived
398,319individuals
Hacking/IT IncidentArchived
3,180,537individuals
Hacking/IT IncidentArchived
3,085individuals
Hacking/IT IncidentArchived
70,636individuals
Hacking/IT IncidentArchived
18,911individuals
Hacking/IT IncidentArchived
4,639individuals
Hacking/IT IncidentArchived
2,688individuals
Unauthorized Access/DisclosureArchived
62,631individuals
Hacking/IT IncidentArchived
310,405individuals
Hacking/IT IncidentArchived
19,107individuals
Hacking/IT IncidentArchived
98,437individuals
Hacking/IT IncidentArchived
519individuals
Hacking/IT IncidentArchived
4,549individuals
Hacking/IT IncidentArchived
455,676individuals
Hacking/IT IncidentArchived
51,854individuals
Hacking/IT IncidentArchived
93,610individuals
Hacking/IT IncidentArchived
11,687individuals
Hacking/IT IncidentArchived
About this data
By Dr. Dereck Mush, MD, MBA, Editor In Chief
It currently holds 8,066 breaches, with submission dates from October 21, 2009 to October 9, 2026, and it refreshes every week from OCR's public breach portal.
We built it for the people who have to act on this data: health system CISOs and security teams benchmarking their own risk, compliance and privacy leads tracking how breaches are reported, and investors doing diligence on healthcare companies and their vendors.
Here's how to read it. Each row is a single report filed with OCR. It shows the covered entity, its state and entity type, the number of individuals affected, the breach type (for example hacking or IT incident, or unauthorized access), where the information was held, and the date it was submitted. Use the filters to narrow by submission date, entity type or breach type, and open any row for its detail page. The monthly roundups group new reports by submission month, so you can see what changed recently without scrolling the full list.
- Source. Every record comes from the HHS OCR breach portal, which lists breaches of unsecured protected health information affecting 500 or more individuals. We show the data as OCR reports it and don't add or change the reported facts. Any editorial note we add is labeled as ours.
- Under investigation vs archive. OCR keeps two lists. "Under investigation" lists HIPAA breaches reported within the last 24 months that are currently under investigation by the Office for Civil Rights. "Archive" holds resolved HIPAA breach reports and/or reports older than 24 months. A breach can move from one list to the other between weekly refreshes.
- Individuals affected. These are the counts reported to OCR. Entities can revise them, and the same person can appear in more than one breach, especially when a single vendor incident is reported separately by several covered entities. Adding the counts together will overstate the number of unique people affected.
- No implication of wrongdoing. A listing means a breach was reported to OCR. It doesn't mean the entity broke the law or was at fault beyond what OCR itself has published. Check OCR's own records for any finding, resolution or penalty.
- Updates. The tracker refreshes weekly. If you spot something that doesn't match OCR's portal, tell us and we'll check it against the source.
Source: HHS Office for Civil Rights Breach Portal. Latest submission in the data: Oct 9, 2026. Refreshed weekly from the portal.