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44 disclosed this week · 26,355 on record

Mount Kisco Surgery Center

Disclosed Jun 25, 202422,139 affectedConfirmed

Official notice

The covered entity (CE), The Mount Kisco Surgery Center dba The Ambulatory Surgery Center of Westchester, reported that it experienced a hacking incident that affected the protected health information (PHI) of 22,139 individuals. The PHI involved included names, Social Security and drivers’ license or state identification numbers, dates of birth, diagnoses, medications, claims and financial information, and health insurance and treatment information. The CE notified HHS, affected individuals, and the media. In response to the breach, the CE provided complimentary credit monitoring services and implemented additional administrative, technical, and security safeguards. The responsible employee was sanctioned.

What is known

People affected22,139 (as reported to HHS)
DisclosedJun 25, 2024
HappenedOct 23, 2023
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
organization to hhsby backfillSource
records2026-09-25
21073 to 22139by backfillSource
disclosed2026-09-25
2024-06-26 to 2024-06-25by backfillSource
summary2026-09-25
empty to The covered entity (CE), The Mount Kisco Surgery Center dba The Ambulatory Surgery Center of Westchester, reported that it experienced a hacking incident that affected the protected health information (PHI) of 22,139 individuals. The PHI inby backfillSource
Added2026-09-25
First recordedby backfillSource

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

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