Breachesby GlyphManaged Care of North America
Disclosed May 26, 20238,923,662 affectedConfirmed
LockBit ransomware attack on MCNA Dental exposes data of 8.9 million people
Dental insurer MCNA, which serves Medicaid and CHIP members, became aware of unauthorized activity on March 6, 2023 and found that an attacker had viewed and copied data from late February. Its Maine filing put the total at more than 8.9 million people; LockBit claimed the attack and leaked data after a ransom was refused.
What is known
| People affected | 8,923,662 (as reported by the organization) |
|---|---|
| Disclosed | May 26, 2023 |
| Discovered | Mar 6, 2023 |
| Happened | Feb 26, 2023 |
| Attack | Ransomware |
| Data exposed | NamesAddressesDates of birthPhone numbersEmailsSocial Security numbersGovernment IDsHealthInsuranceFinancial |
| Sector | Insurance · US |
| Status | Confirmed |
Sources
California Attorney General breach notice: Managed Care of North AmericaWashington Attorney General breach notice: Managed Care of North AmericaOregon DOJ breach notice: Managed Care of North AmericaCalifornia AG data breach notice: Managed Care of North America, Inc.Ransomware attack on US dental insurance giant exposes data of 9 million patientsVermont Attorney General: 2023-05-26 Managed Care of North America Data Breach Notice to ConsumersIndiana Attorney General 2023 data breach report: Managed Care of North AmericaHHS OCR breach report (archive, resolved): Managed Care of North America (Business Associate, GA)
Notices filed
History of this record
empty to https://ocrportal.hhs.gov/ocr/breach/breach_report.jsfby backfillSource
8900000 to 8923662by backfillSource
empty to https://ago.vermont.gov/document/2023-05-26-managed-care-north-america-data-breach-notice-consumersby backfillSource
health to insuranceby seedSource
hacking to ransomwareby seedSource
[] to ["names","addresses","dob","phone","emails","ssn","government-id","health","insurance","financial"]by seedSource
empty to organizationby seedSource
empty to 8900000by seedSource
empty to Dental insurer MCNA, which serves Medicaid and CHIP members, became aware of unauthorized activity on March 6, 2023 and found that an attacker had viewed and copied data from late February. Its Maine filing put the total at more than 8.9 miby seedSource
empty to LockBit ransomware attack on MCNA Dental exposes data of 8.9 million peopleby seedSource
unknown to hackingby backfillSource
empty to 2023-03-06by backfillSource
First recordedby backfillSource
First seen 2026-09-25 (California AG), confirmed by California AG. Record counts are as reported. Not legal advice.