Health tech giant TriZetto admitted that the personal and health information of more than 3.4 million people was stolen in a 2024 cyberattack, but the company went undetected for almost a year.
The technology company, owned by multinational conglomerate Cognizant, serves 875,000 health care providers and approximately 200 million people across the United States, according to its website. Clinics and healthcare providers use TriZetto to evaluate patient treatment insurance.
Trisette said in a filing Friday with the Maine attorney general that hackers stole transaction reports related to patients’ insurance eligibility from its servers.
The data includes personal information such as the patient’s name, date of birth, home address, and social security number, as well as medical information such as the provider’s name, demographic data, and health plan and insurance details.
TriZetto said it identified the breach on October 2, 2025, but later discovered that the hackers had access dating back to November 2024.
Cognizant spokesman William Abelson said the company had “eliminated the threat” to the environment, but did not say why it took the company a year to detect the breach.
Several organizations have confirmed that patient information has been compromised in cyberattacks. One of them, OCHIN, is a nonprofit consulting firm that provides health care technology to approximately 300 local and regional health care providers across the United States. Other health care providers in California also confirmed.
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According to TriZetto, not all customers were affected by the breach.
TriZetto is the latest major health tech company to be hacked in recent years.
In 2024, a ransomware attack on Change Healthcare, another medical technology giant that processes approximately 15 billion healthcare transactions, allowed hackers to steal more than 192 million patient files. The cyber attack caused power outages across the United States, leaving many people without treatment and medication.
Updated with comment from Cognizant.
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