Anthem Data Breach History

This page tracks the Anthem data breach history and cybersecurity incidents affecting Anthem (United States). BreachHistory currently indexes 9 publicly disclosed or catalogued incidents spanning 2006 through 2017, with approximately 240.9 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 Anthem 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, while 1 remain unverified claims pending independent verification.

Largest Anthem Data Breaches

The largest indexed incidents include the 2016 — Anthem: Data breach reported, 80.0M records, the 2015 — Anthem: Feb 2015: Names, dates of birth, member ID/ social…, and the 2015 — Anthem: Anthem, the second largest health insurance company…, 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 Anthem or a regulator. Below is the list of large data breaches:

• 2016 2016 — Anthem: Data breach reported, 80.0M records — about 80.0M records exposed · Catalogued incident
• 2015 2015 — Anthem: Feb 2015: Names, dates of birth, member ID/ social… — about 80.0M records exposed · Catalogued incident
• 2015 2015 — Anthem: Anthem, the second largest health insurance company… — about 80.0M records exposed · Catalogued incident
• 2010 2010 — Anthem: More than 200,000 Anthem Blue Cross customers this… — about 470.0K records exposed · Catalogued incident
• 2006 2006 — Anthem: A lockbox holding personal information of health… — about 396.3K records exposed · Unverified claim
• 2011 2011 — Anthem: Letters soliciting dental and vision coverage were… — about 31.1K records exposed · Catalogued incident
• 2017 2017 — Anthem: A data breach may have exposed personal health… — about 18.5K records exposed · Catalogued incident
• 2013 2013 — Anthem: A Connextions employee used Social Security numbers… — about 6.0K records exposed · Catalogued incident

What Information Was Exposed?

Depending on the incident, exposed data may include email addresses, passwords, phone numbers, names, profile information, account identifiers, and other personal information (PII). The exact data varies between incidents, so review each breach page before assuming your information was affected.

Anthem Data Breach 2026

At the time of this update, no Anthem 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 Anthem 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 Anthem 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.