People search UnitedHealth data breach timeline because regulated data and trust are existential—one incident triggers class actions and regulator exams. BreachHistory indexes 5 UnitedHealth-linked incidents, with headline counts up to 100M+ in catalog rows. This page maps every attested event through 2026 with internal links to canonical records.
Why UnitedHealth breach history matters
UnitedHealth operates in Healthcare (United States). Across indexed rows, recurring themes include ransomware and extortion, credential theft and social engineering. Understanding the chronological pattern helps security teams, customers, and regulators separate confirmed disclosures from forum marketing.
Full timeline through 2026
2024 — 100M affected
Cataloged incident. ALPHV/BlackCat ransomware attack on Change Healthcare subsidiary. Largest healthcare breach in U.S. history. Health insurance member IDs, diagnoses, treatment info, SSNs, and billing codes exposed. Widespread disruption to pharmacies and hospitals. Exposed categories include Social Security numbers, Credentials, Health information, Treatment information. BreachHistory cites approximately 100M+ affected records in this row. See the uhg2024ch and canonical BreachHistory entry.
2024 — — Change Healthcare
Cataloged incident. Ransomware. Change Healthcare. Exposed categories include Names, emails, addresses, and other PII. No attested victim count is published for this row yet. See the unitedhealth2024 and canonical BreachHistory entry.
2016 — — UnitedHealth Group: Location of breached information: Unauthorized…
Cataloged incident. Location of breached information: Unauthorized Access/Disclosure Business associate present: No Exposed categories include Personal information. BreachHistory cites approximately 1K+ affected records in this row. See the unitedhealth2016 and canonical BreachHistory entry.
2012 — — UnitedHealth Group: Location of breached information: Unauthorized…
Cataloged incident. Location of breached information: Unauthorized Access/Disclosure Business associate present: No Exposed categories include Personal information. BreachHistory cites approximately 19K+ affected records in this row. See the unitedhealth2012 and canonical BreachHistory entry.
2010 — — UnitedHealth Group: A breach involving UnitedHealth Group and its…
Cataloged incident. A breach involving UnitedHealth Group and its business associate CareCore National was posted on the Health and Human Services (HHS) website. Unauthorized persons were able to access paper records on or around July 8. Exposed categories include Personal information. BreachHistory cites approximately 1K+ affected records in this row. See the unitedhealth2010 and canonical BreachHistory entry.
Patterns and analysis
- Ransomware and extortion — appears across multiple UnitedHealth catalog entries; prioritize controls that address this class of failure.
- Credential theft and social engineering — appears across multiple UnitedHealth catalog entries; prioritize controls that address this class of failure.
- Record-count hygiene — BreachHistory indexes actor-cited figures separately from company-confirmed totals; read each row's technicalWriteup before treating counts as fact.
- 2026 monitoring — New disclosures roll into this timeline as they are verified or labeled unverified per catalog policy.
What to do if you may be affected
- Step 1: Enable phishing-resistant MFA on every account tied to this brand.
- Step 2: Use unique passwords and a password manager—breach rows often involve credential reuse.
- Step 3: Monitor official company breach notices and regulator filings, not dark-web downloads.
- Step 4: Watch for medical-ID theft and billing fraud after health-data incidents.
- Step 5: Bookmark the UnitedHealth company page for new 2026+ disclosures.
Canonical BreachHistory hub
Explore every indexed row: breachhistory.com/unitedhealth · Latest: uhg2024ch.
Sources: BreachHistory catalog (5 rows for UnitedHealth), company and regulator disclosures cited in individual breach records.