Health tech giant TriZetto has confirmed that more than 3.4 million personal and health information was stolen in a 2024 cyberattack that the company failed to detect for nearly a year.
The technology company, owned by multinational conglomerate Cognizantserves about 200 million people to 875,000 healthcare providers across the US, according to its website. Practices and healthcare providers use TriZetto to evaluate patients’ insurance coverage for medical treatments.
TriZetto said a filing with the Maine attorney general on Friday that hackers stole patient insurance eligibility transaction reports from the company’s servers.
The data includes personal information such as patient names, dates of birth, home addresses, and social security numbers, as well as information about their health care, such as their provider’s name, demographics, and health and insurance information.
TriZetto said it detected the breach on October 2, 2025, but later discovered that hackers had access as early as November 2024.
Cognizant spokesman William Abelson said the company “removed the threat” to its environment, but did not say why it took the company a year to detect the breach.
Several organizations have confirmed that their patient information was compromised in the cyber attack. One of them is OCHINa nonprofit consulting firm that provides healthcare technology to approximately 300 rural and community care providers across the United States. Other health care providers throughout California have also confirmed.
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According to TriZetto, not every customer was affected by the breach.
TriZetto is the latest major health tech company to confirm a hack in recent years.
In 2024, a ransomware attack on Change Healthcare, another healthcare tech giant that processes around 15 billion healthcare transactions, allowed hackers to make off with more than 192 million patient records. The cyber attack triggered shutdowns across the US, leaving many without access to medical treatment or medication.
Updated with comment from Cognizant.
