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Marathon Health data breach

Was I affected?

Marathon Health confirmed a breach affecting about 5.7 million people, exposing names, dates of birth, Social Security numbers and addresses. You may be affected if you or a family member used a Marathon Health clinic or were enrolled through an employer, union or public-sector health plan that works with Marathon (for example Indiana University), even if you never visited a clinic.

Marathon Health breach facts
AnnouncedOct 29, 2026
When it happenedAugust 24, 2026
CountryUnited States
People affected5.7 million
Data exposedNames, Dates of birth, Social Security numbers, Addresses, Medical information and Health insurance details
StatusConfirmed by the company or a regulator filing

What happened

Marathon Health, which runs employer-sponsored onsite, near-site and virtual clinics, said someone posing as its IT staff tricked an employee into handing over login details on August 24, 2026, then used them to export data from a cloud-hosted application within a few hours. Notices list names, dates of birth, contact details and Social Security numbers, and some state filings also cite medical and health insurance information. Marathon reportedly told Texas regulators that 5,684,735 people are being notified, which would make it one of the largest health data breaches of 2026. It is offering 12 or 24 months of free identity monitoring.

What should I do?

  1. Enroll in the free Epiq identity monitoring using the code in your Marathon Health letter.
  2. Place a free credit freeze with Equifax, Experian and TransUnion, since Social Security numbers were included.
  3. Review explanation-of-benefits statements from your health insurer and report any care or claims you don't recognize.
  4. Be wary of calls or emails claiming to be from Marathon Health or your employer's health plan that ask for personal or insurance details; call the number in your letter (888-517-6416) instead.
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