HHS OCR report · 2013
Mosaic data breach
OCR report facts
- Covered entity
- Mosaic
- Entity type
- Healthcare Provider
- State
- Nebraska
- Individuals affected
- 3,857
- Submission date
- Dec 11, 2013
- Type of breach
- Unauthorized Access/Disclosure
- Location of breached information
- Business associate present
- No
- Status
- Archive (closed)
OCR description
The covered entity (CE), Mosaic, discovered multiple employee email accounts that had fallen victim to a phishing attack. The affected e-mail accounts contained the following types of protected health information (PHI): clients’ names, dates of birth, addresses, telephone numbers, government-issued identification numbers, medical record numbers, insurance identification numbers, payment information, Medicaid and Medicare numbers, and in some instances social security numbers. This breach aff...
Text as published on the HHS OCR breach portal.
Frequently asked questions
How many people were affected by the Mosaic data breach?
The report to HHS OCR lists 3,857 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Dec 11, 2013.
What type of breach was it?
The OCR portal lists the type of breach as Unauthorized Access/Disclosure, with the breached information located in: Email.
Is the investigation still open?
No. The report is in the OCR portal archive, which holds reports where OCR has closed its review.
Is a breach notice letter from Mosaic legitimate?
This site cannot verify letters. Check the sender against the organisation's official website and the HHS OCR breach portal, and avoid calling numbers or clicking links only listed in an unexpected message. See our guide on what to do after a data breach notice.
Source: HHS OCR Breach Portal, OCR export October 2026. Network USA is not affiliated with HHS or Mosaic.