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44 disclosed this week · 26,355 on record

Cancer Treatment Centers of America at Midwestern Regional Medical Center

Disclosed Mar 19, 2021104,808 affectedConfirmed

Official notice

Cancer Treatment Centers of America at Midwestern Regional Medical Center, the covered entity (CE), reported that an employee was the subject of an email phishing scheme that compromised the protected health information (PHI) of 104,808 individuals. The PHI involved included names, medical record numbers, health insurance information, and treatment information. The CE notified HHS, affected individuals, the media, and posted substitute notice on its website. In its mitigation efforts, the CE implemented additional administrative, technical, and security safeguards to better protect its sensitive data. All staff were retrained.

What is known

People affected104,808 (as reported to HHS)
DisclosedMar 19, 2021
DiscoveredJan 18, 2021
HappenedJan 12, 2021
AttackHacking
Data exposedNamesHealth
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

History of this record
attack2026-09-25
unknown to hackingby backfillSource
data_types2026-09-25
[] to ["names","health"]by backfillSource
records_basis2026-09-25
empty to hhsby backfillSource
records2026-09-25
empty to 104808by backfillSource
summary2026-09-25
empty to Cancer Treatment Centers of America at Midwestern Regional Medical Center, the covered entity (CE), reported that an employee was the subject of an email phishing scheme that compromised the protected health information (PHI) of 104,808 indby backfillSource
discovered2026-09-25
empty to 2021-01-18by backfillSource
Added2026-09-25
First recordedby backfillSource

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

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