HHS OCR report ยท 2023
Centers for Medicare & Medicaid Services data breach
OCR report facts
- Covered entity
- Centers for Medicare & Medicaid Services
- Entity type
- Health Plan
- State
- Maryland
- Individuals affected
- 2,342,357
- Submission date
- Jul 28, 2023
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Network Server
- Business associate present
- Yes
- Status
- Archive (closed)
OCR description
The covered entity (CE), Centers for Medicare & Medicaid Services, reported that a software application used by its business associate (BA) exposed the protected health information (PHI) of 2,342,357 individuals. The PHI involved included names, dates of birth, addresses, Social Security numbers, diagnoses, claims and health insurance information, and other treatment information. The CE notified HHS, the affected individuals, the media, and provided substitute notice. In response to the breac...
Text as published on the HHS OCR breach portal.
Other reports by Centers for Medicare & Medicaid Services
| Covered entity | State | Entity type | Individuals | Submitted | Type of breach | Status |
|---|---|---|---|---|---|---|
| Centers for Medicare & Medicaid Services | MD | Health Plan | 107,154 | Jun 30, 2025 | Hacking/IT Incident | Under investigation |
| Centers for Medicare & Medicaid Services | MD | Health Plan | 3,112,815 | Sep 6, 2024 | Hacking/IT Incident | Archive (closed) |
| Centers for Medicare & Medicaid Services | MD | Health Plan | 10,011 | Apr 7, 2023 | Unauthorized Access/Disclosure | Archive (closed) |
Frequently asked questions
How many people were affected by the Centers for Medicare & Medicaid Services data breach?
The report to HHS OCR lists 2,342,357 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Jul 28, 2023.
What type of breach was it?
The OCR portal lists the type of breach as Hacking/IT Incident, with the breached information located in: Network Server.
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 Centers for Medicare & Medicaid Services 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 Centers for Medicare & Medicaid Services.