Mount Kisco Surgery Center
Disclosed Jun 25, 20242 years ago22,139 affectedConfirmed
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 affected | 22,139 (as reported to HHS) |
|---|---|
| Disclosed | Jun 25, 2024 |
| Happened | Oct 23, 2023 |
| Attack | Hacking |
| Data exposed | Names, Health |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| Indiana Attorney General 2024 data breach report: Mount Kisco Surgery Centerin.gov · Official notice | Official notice |
| HHS OCR breach report (archive, resolved): Mount Kisco Surgery Center (Healthcare Provider, NY)ocrportal.hhs.gov · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| HHS archivetotal | Jun 25, 2024 | 22,139 |
| Indiana AGresidents of IN | Jun 26, 2024 | 3 |
History of this record
- 2026-09-25 · attack: unknown to hacking · backfill source
- 2026-09-25 · data_types: [] to ["names","health"] · backfill source
- 2026-09-25 · records_basis: organization to hhs · backfill source
- 2026-09-25 · records: 21073 to 22139 · backfill source
- 2026-09-25 · disclosed: 2024-06-26 to 2024-06-25 · backfill source
- 2026-09-25 · summary: 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 in · backfill source
- 2026-09-25 · added · backfill source
First seen 2026-09-25 (Indiana AG), confirmed by Indiana AG. Record counts are as reported. Not legal advice.