Ascension Health

Disclosed Jul 3, 20245,466,931 affectedConfirmed

What is known

People affected	5,466,931 (as reported to HHS)
Disclosed	Jul 3, 2024
Discovered	May 8, 2024
Happened	Feb 29, 2024
Attack	Ransomware
Data exposed	NamesHealth
Sector	Healthcare · US
Status	Confirmed

Sources

Official noticeoag.ca.gov

California Attorney General breach notice: Ascension Health

Official noticeatg.wa.gov

Washington Attorney General breach notice: Ascension Health

Official noticejustice.oregon.gov

Oregon DOJ breach notice: Ascension Health

Official noticeocrportal.hhs.gov

HHS OCR breach report: Ascension Health (Healthcare Provider, MO)

Official noticein.gov

Indiana Attorney General 2025 data breach report: Ascension Health

Notices filed

TotalJul 3, 2024

HHS archive5,466,931 people

Residents of CADec 19, 2024

California AGCount not stated

Residents of WADec 19, 2024

Washington AG5,787 people

Residents of ORDec 19, 2024

Oregon DOJ5,599,699 people

Residents of CAFeb 3, 2025

California AGCount not stated

Residents of ORFeb 3, 2025

Oregon DOJ5,466,931 people

TotalApr 28, 2025

HHS OCR437,329 people

Residents of INApr 28, 2025

Indiana AG169,183 people

History of this record

records2026-09-25

437329 to 5466931by backfillSource

disclosed2026-09-25

2024-12-19 to 2024-07-03by backfillSource

source2026-09-25

empty to https://www.in.gov/attorneygeneral/consumer-protection-division/id-theft-prevention/files/DB-Year-to-Date-Report-2025.pdfby backfillSource

data_types2026-09-25

[] to ["names","health"]by backfillSource

records_basis2026-09-25

empty to hhsby backfillSource

records2026-09-25

empty to 437329by backfillSource

attack2026-09-25

unknown to ransomwareby backfillSource

discovered2026-09-25

empty to 2024-05-08by backfillSource

disclosed2026-09-25

2025-02-03 to 2024-12-19by 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.

Everything about Ascension Health