UnitedHealth Group Data Breach History

This page tracks the UnitedHealth Group data breach history and cybersecurity incidents affecting UnitedHealth Group (United States). BreachHistory currently indexes 5 publicly disclosed or catalogued incidents spanning 2010 through 2024, with approximately 100.0 million records reported as exposed across all indexed events. These totals may include overlapping datasets or third-party estimates and should not be interpreted as unique affected users.

The UnitedHealth Group breach timeline includes major data breaches, cyber attacks, data leaks, credential exposures, API abuse, and other security incidents. Each incident provides details on the estimated records exposed, attack method, affected data types, and supporting public sources. Currently, 0 incidents are company-confirmed.

Largest UnitedHealth Group Data Breaches

The largest indexed incidents include the 2024 Change Healthcare ransomware — 100M affected, the 2012 — UnitedHealth Group: Location of breached information: Unauthorized…, and the 2016 — UnitedHealth Group: Location of breached information: Unauthorized…, along with additional historical incidents involving exposed passwords, public databases, and large-scale data scraping. Record counts originating from threat actors or leak sites should be treated as estimates unless confirmed by UnitedHealth Group or a regulator. Below is the list of large data breaches:

• 2024 2024 Change Healthcare ransomware — 100M affected — about 100.0M records exposed · Catalogued incident
• 2012 2012 — UnitedHealth Group: Location of breached information: Unauthorized… — about 19.1K records exposed · Catalogued incident
• 2016 2016 — UnitedHealth Group: Location of breached information: Unauthorized… — about 1.4K records exposed · Catalogued incident
• 2010 2010 — UnitedHealth Group: A breach involving UnitedHealth Group and its… — about 1.3K records exposed · Catalogued incident

What Information Was Exposed?

Depending on the incident, exposed data may include email addresses, passwords and login credentials, Social Security numbers and national IDs, names, physical addresses, health and medical (PHI) records, and other personal information (PII). The exact data varies between incidents, so review each breach page before assuming your information was affected.

UnitedHealth Group Data Breach 2026

At the time of this update, no UnitedHealth Group data breach has been catalogued for 2026. New incidents are added as official disclosures, regulatory filings, or credible cybersecurity reports become available.

What To Do If You Were Affected

If you believe your account may have been involved in a UnitedHealth Group data breach, change any reused passwords, enable multi-factor authentication (MFA), monitor your account for suspicious activity, and be cautious of phishing emails or fake breach notifications.

This UnitedHealth Group breach history is maintained by BreachHistory using public disclosures, regulatory filings, security research, and clearly labelled third-party claims. For the complete breach timeline, records exposed, incident details, and AI Breach Risk Score, explore the sections on this page.