TriZetto confirms that the health and personal data of 3.4 million people was stolen during the hack

Health tech giant TriZetto has confirmed that the personal and health information of more than 3.4 million people was stolen in a 2024 cyberattack, which the company failed to detect for nearly a year.

The technology company, owned by multinational company Cognizant, serves about 200 million people across 875,000 health care providers across the United States, according to its website. Physician offices and healthcare providers use TriZetto to evaluate patients’ insurance for medical treatment.

TriZetto said in a filing with the Maine Attorney General on Friday that hackers stole patients’ insurance eligibility transaction reports from the company’s servers.

The data includes personal information such as patients’ names, dates of birth, home addresses, and Social Security numbers, as well as information about their health care, such as provider name, demographic data, and health and insurance details.

TriZetto said it identified the breach as October 2, 2025, but later discovered that hackers had access to data as far back as November 2024.

A Cognizant spokesperson did not immediately respond to a request for comment, including why it took the company a year to discover the breach.

Several organizations confirmed that their patients’ information had been compromised in the cyber attack. One such company is OCHIN, a nonprofit consulting firm that provides health care technology to about 300 rural and community care providers across the United States. Other health care providers across California have also confirmed this.

According to TriZetto, not all customers were affected by the breach.

TriZetto is the latest major health technology company to confirm a breakthrough in recent years.

In 2024, a ransomware attack on Change Healthcare, another health tech giant that processes about 15 billion healthcare transactions, allowed hackers to steal more than 192 million patient files. The cyberattack led to service outages across the United States, leaving many without access to medical treatment or medications.