- State
- MO
- Covered entity type
- Business Associate
- Individuals affected
- 305,088
- Business associate present
- Yes
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Network Server
- First seen by InfoSec Signals
- Sep 23, 2026
- Last seen in OCR export
- Oct 25, 2026
OCR description
Thompson Coburn LLP, the business associate (BA), reported that it experienced a ransomware attack affecting the electronic protected health information (ePHI) of 305,088 individuals. The ePHI involved included demographic, clinical, and financial information. The BA notified HHS, affected individuals, and the media. The BA took several corrective actions in response to the breach including improving its cybersecurity and providing additional HIPAA training to its workforce members.
Change history
- Sep 23, 2026Added to OCR's archive list
Source: HHS OCR Breach Portal, U.S. Department of Health and Human Services, Office for Civil Rights about this source
Records are reproduced as published; entity names and figures are OCR's.