Mainline Health Data Breach Impacts 101,104 Patients

Mainline Health Systems Inc, a healthcare provider based in Southeast Arkansas, experienced a data breach on or about April 10, 2024 affecting 101,104 individuals across the United States. The cybersecurity incident involved unauthorized access to sensitive patient information, with both personally identifiable information (PII) and protected health information (PHI) exposed.

On May 21, 2025 discovered that compromised included full name, date of birth, Social Security Number, U.S. driver’s license number, financial account and payment card numbers, medical record number, patient ID, Medicaid number, health insurance policy and group numbers, medical diagnosis and treatment details, clinical and prescription information, provider location and provider name.

The breach was disclosed to the Maine Attorney General’s office on June 23, 2025, reporting one Maine resident affected. Mainline Health Systems also published a Notice of Data Security Incident on its own website.

Mainline Health Systems Inc's response

Mainline Health Systems Inc began notifying individuals affected by the data breach on June 20, 2025. Patients who may have had their Social Security number exposed are being offered free credit monitoring services.

If you receive notification from Mainline Health Systems about this breach, you may want to:

• Sign up for any free credit monitoring services, if offered.
• Monitor your credit reports and financial accounts for any unusual activity.
• Be alert for phishing emails or phone calls that may use your exposed information.
• Consider placing a fraud alert or credit freeze with major credit bureaus.

Mainline Health Systems has set up a response line for affected individuals with questions at 1-855-201-4160, available Monday through Friday 8:00 a.m. to 8:00 p.m. Central Time.

For more information about the organization, visit the Mainline Health Systems website.