Mission Neighborhood Health Center Data Breach Lawsuit Investigation

Patients of Mission Neighborhood Health Center were recently notified that their protected health information was involved in a cyber-incident originating with the clearinghouse TriZetto. If you received a breach letter, you may be entitled to free legal assistance and identity-protection resources—contact our team for a no-cost case review.

Key Takeaways

• Incident window: Unauthorized access to TriZetto systems occurred in November 2024; contained on October 2, 2025.
• Discovery: OCHIN learned of the breach on December 9, 2025, and informed Mission Neighborhood Health Center (MNHC) on December 12, 2025.
• Patient notifications mailed: December 31, 2025.
• Data types exposed: names, addresses, dates of birth, Social Security numbers, health-insurance details, and other demographic or medical information. No payment-card or bank data was involved.
• Next steps for patients: monitor insurance statements, review Explanation of Benefits (EOBs), and report any suspicious activity to your health plan.

What Happened?

On December 12, 2025, Mission Neighborhood Health Center learned from its electronic health record vendor OCHIN that OCHIN’s subcontractor, TriZetto, experienced a data-security incident impacting certain TriZetto systems. Although MNHC’s own network was not directly accessed, patient information residing within TriZetto’s environment was affected.

Timeline of events:

• November 2024: Unauthorized access occurs within TriZetto systems.
• October 2, 2025: TriZetto contains the incident and secures its environment.
• December 9, 2025: OCHIN becomes aware of the breach.
• December 12, 2025: OCHIN notifies MNHC and provides a list of potentially affected patients.
• December 31, 2025: MNHC issues consumer notifications.
• January 7, 2026: Breach publicly reported to the California Attorney General.

What Information Was Involved?

The data elements potentially exposed include:

• Full name, mailing address, and date of birth
• Social Security number (in some cases)
• Health-insurance information such as member number, insurer name, provider name, and details for primary insured and dependents
• Other demographic, health, or health-insurance information

No payment card, bank-account, or other direct financial data was involved. MNHC states it is not aware of any misuse of the information to date.

Mission Neighborhood Health Center’s Response

According to the notice filed with the California Attorney General, Mission Neighborhood Health Center:

• Worked with OCHIN and TriZetto to investigate the incident and confirm mitigation.
• Verified that TriZetto implemented corrective actions to secure its systems and prevent further unauthorized access.
• Will report the incident to the California Department of Public Health, the U.S. Department of Health and Human Services, the California Attorney General’s Office, and impacted health insurers, as required by law.

What You Can Do

MNHC recommends the following protective steps:

• Carefully review your health-insurance statements and Explanation of Benefits (EOBs) for unfamiliar services or charges.
• Contact your health plan immediately if you detect suspicious or incorrect activity.
• Maintain copies of medical and insurance records for reference.

Company Overview

Mission Neighborhood Health Center is a community health organization headquartered at 240 Shotwell Street, San Francisco, CA. Founded in 1967, the center provides comprehensive medical, behavioral-health, and social services to patients in the Bay Area.

• Website: mnhc.org
• Industry: Healthcare
• Headquarters: San Francisco, California, United States
• Year Founded: 1967

Frequently Asked Questions

I received a data breach letter from Mission Neighborhood Health Center — what should I do?

Follow the steps outlined in the letter: monitor your Explanation of Benefits, watch for unfamiliar insurance activity, and contact your health plan if you see anything suspicious. You may also seek a free legal consultation to understand your rights.

How do I submit a claim related to the Mission Neighborhood Health Center data breach?

You can start by contacting a data-privacy attorney who is investigating the incident. Have your breach notice and any evidence of fraud on hand to accelerate the review.

Am I eligible to join a lawsuit against Mission Neighborhood Health Center?

Eligibility generally depends on whether your information was compromised and if you suffered damages such as time spent monitoring accounts, unreimbursed fraud, or emotional distress. A case review can confirm your status at no cost.

What information did the Mission Neighborhood Health Center breach expose?

The incident may have exposed your name, address, date of birth, Social Security number, health-insurance details, and other demographic or health information. No payment-card or bank data was involved.

How many people were affected by the Mission Neighborhood Health Center breach?

As of the most recent filing, MNHC has not disclosed the total number of impacted patients.

How can I get the official breach notice (PDF) for Mission Neighborhood Health Center?

You can download the notice directly from the California Attorney General’s website using the button above titled “Download Official Breach Notice (PDF).”