- State
- MA
- Covered entity type
- Healthcare Provider
- Individuals affected
- 4,293
- Business associate present
- Yes
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Network Server
- First seen by InfoSec Signals
- 9/23/2026
- Last seen in OCR export
- 9/23/2026
OCR description
Hackers caused a breach of protected health information (PHI) at Patterson Dental Supply, Inc., a business associate (BA) of the covered entity (CE), Massachusetts General Hospital. The breach affected the PHI of approximately 4,293 individuals, and included demographic and clinical information. The CE provided breach notification to HHS, affected individuals, and the media. OCR’s investigation revealed that the CE and BA had a business associate agreement in place at the time of the breach. OCR reviewed the BA agreement and determined that it appeared to comply with the requirements of the HIPAA Rules. OCR has opened a separate review of the BA concerning the underlying breach.
Change history
- 9/23/2026Added 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.