HHS OCR report ยท 2023
Oak Street Health data breach
OCR report facts
- Covered entity
- Oak Street Health
- Entity type
- Healthcare Provider
- State
- Illinois
- Individuals affected
- 3,169
- Submission date
- Nov 24, 2023
- Type of breach
- Unauthorized Access/Disclosure
- Location of breached information
- Paper/Films
- Business associate present
- Yes
- Status
- Archive (closed)
OCR description
Oak Street Health, the covered entity (CE), reported that an employee of its vendor mailed the protected health information (PHI) of 3,169 individuals to the wrong recipients. The PHI involved included names, birthdates, addresses, phone numbers, and health insurance and other treatment information. The CE notified HHS, affected individuals, and the media. In its mitigation efforts, the CE strengthened its administrative safeguards and ended its business relationship with the vendor.
Text as published on the HHS OCR breach portal.
Frequently asked questions
How many people were affected by the Oak Street Health data breach?
The report to HHS OCR lists 3,169 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Nov 24, 2023.
What type of breach was it?
The OCR portal lists the type of breach as Unauthorized Access/Disclosure, with the breached information located in: Paper/Films.
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 Oak Street Health 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 Oak Street Health.