Every public data breach

44 disclosed this week · 26,355 on record

Centers for Medicare & Medicaid Services

Disclosed Apr 7, 20232,342,357 affectedConfirmed

Official notice

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 breach, the CE provided complimentary credit monitoring services and the BA implemented additional administrative, technical, and security safeguards to better protect PHI.

What is known

People affected2,342,357 (as reported to HHS)
DisclosedApr 7, 2023
AttackHacking
Data exposedNamesHealth
SectorInsurance · US
StatusConfirmed

Sources

Notices filed

Other breaches at Centers for Medicare & Medicaid Services

History of this record
disclosed2026-09-25
2023-07-28 to 2023-04-07by backfillSource
Added2026-09-25
First recordedby backfillSource

First seen 2026-09-25 (HHS archive), confirmed by HHS OCR. Record counts are as reported. Not legal advice.

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