BreachCensus

MCBS, LLC

private companyHealthcareUnited States of America

MCBS, LLC is a healthcare organisation in California. It appears on the HHS OCR breach portal, the Massachusetts Attorney General breach-notification register, the California Attorney General breach-notification register and the Texas Attorney General breach-notification register with 1 confirmed incident (2 filings); the most recent notice was filed on June 26, 2026.

Data as of September 13, 2026.

Confirmed incident

Filed in CA, TX, GA and MA — Hacking/IT Incident

The same incident was filed separately with 4 jurisdictions within a few days of each other (CA, TX, GA and MA) — shown here as one incident.

Occurred
September 22, 2025
Disclosed
June 26, 2026
Records affected
1,261,464

Reported with a business associate involved (HHS portal)

Timeline

  1. June 26, 2026
    Reported to regulator Regulator

    CA AG breach notification: an unknown number of California residents affected

    source
  2. June 26, 2026
    Reported to regulator Regulator

    MA AG breach notification: 383 Massachusetts residents affected

    source
  3. June 26, 2026
    Reported to regulator Regulator

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

    source
  4. June 30, 2026
    Reported to regulator Regulator

    TX AG breach notification: 13,302 Texas residents affected

    source
What a California notice means

Governed by Cal. Civ. Code §1798.82. A copy of the notification must be sent to the Attorney General when a single breach requires notifying more than 500 California residents.

Note: no affected-count is published on this register.

California breach-notification register ↗

What a Texas notice means

Governed by Tex. Bus. & Com. Code §521.053. Notice to the Attorney General is required when a breach affects at least 250 Texas residents.

Note: the published count is a total, not limited to Texas residents.

Texas breach-notification register ↗

What a Massachusetts notice means

Governed by 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 ↗