BreachCensus

Mainline Health Systems Inc

healthcareHealthcareUnited States of America

Mainline Health Systems Inc is a healthcare organisation in United States of America. It appears on the HHS OCR breach portal and the Massachusetts Attorney General breach-notification register with 1 confirmed incident; the most recent notice was filed on June 23, 2025.

Data as of September 3, 2026.

Sources

Confirmed incident

Filed in AR and MA — Hacking/IT Incident

The same incident was filed separately with 2 jurisdictions within a few days of each other (AR and MA) — shown here as one incident.

Disclosed
June 23, 2025
Records affected
101,104

Was I affected? →

Timeline

  1. June 23, 2025
    Reported to regulator Regulator

    MA AG breach notification: 7 Massachusetts residents affected

    source
  2. June 23, 2025
    Reported to regulator Regulator

    HHS OCR breach portal listing: Hacking/IT Incident; Network Server

    source
  3. June 27, 2025
    Litigation filed Court

    RECAP docket 4:25-cv-00647 (ared): Moore v. Mainline Health Systems Inc

    source

Litigation

What a Massachusetts notice means

Required under M.G.L. c. 93H. Notice to the Attorney General is required for a breach affecting any number of Massachusetts residents' personal information -- the statute sets no minimum count.

Note: the count is Massachusetts residents only, not a total.

Massachusetts breach-notification register ↗

Related

Same sector and location

Disclosed around the same time