HHS OCR report · 2016
Mayfield Clinic Inc data breach
OCR report facts
- Covered entity
- Mayfield Clinic Inc
- Entity type
- Healthcare Provider
- State
- Ohio
- Individuals affected
- 23,341
- Submission date
- Apr 23, 2016
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Business associate present
- No
- Status
- Archive (closed)
OCR description
An unauthorized person sent a fraudulent email with an attachment that triggered a download of a ransomware virus to 23,341 email addresses held by the covered entity’s (CE’s) business associate (BA) on its behalf. The protected health information (PHI) involved in the breach included email addresses. The CE sent an email notification to affected individuals on the day of the incident and sent another email notification two days later. The CE provided breach notification to HHS, affected i...
Text as published on the HHS OCR breach portal.
Frequently asked questions
How many people were affected by the Mayfield Clinic Inc data breach?
The report to HHS OCR lists 23,341 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Apr 23, 2016.
What type of breach was it?
The OCR portal lists the type of breach as Hacking/IT Incident, 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 Mayfield Clinic Inc 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 Mayfield Clinic Inc.