Blue Cross Blue Shield of Montana Data Breach Exposes 462,000 Residents
Summary
Blue Cross Blue Shield of Montana disclosed a data breach affecting 462,000 residents after unauthorized access between November 8, 2024, and March 5, 2025. The breach exposed names, addresses, billing information, and medical data. Montana State Auditor and Commissioner of Securities and Insurance James Brown announced a full-scale investigation into the incident and whether notification requirements were followed.
What changed
Blue Cross Blue Shield of Montana reported a data breach exposing personal and medical information of 462,000 Montana residents over a four-month period. The breach, discovered between November 8, 2024, and March 5, 2025, included names, addresses, billing data, and medical records. Montana State Auditor James Brown characterized the incident as deeply disturbing and announced a full-scale investigation to determine whether required breach notification and response procedures were followed.
Affected BCBSMT members should monitor their Explanation of Benefits statements for unauthorized claims or services, report any suspicious activity immediately to both BCBSMT and the Montana Commissioner of Securities and Insurance, and remain vigilant for potential identity theft or medical fraud. Healthcare providers and insurers in Montana should note this enforcement action as a reminder to review their own data security and breach notification procedures.
What to do next
- Review Explanation of Benefits statements for unauthorized activity
- Report suspicious activity to BCBSMT and Montana CSI immediately
- Visit csimt.gov for updates on the investigation
Archived snapshot
Apr 12, 2026GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.
Nick Northern | Newsbreak
October 23, 2025
Massive Data Breach Exposes Personal Information Of Montanans
Potentially half of all Montana residents are at risk after a data breach exposed their names, addresses, billing, and medical data.
That’s according to Blue Cross Blue Shield of Montana, which is now under investigation from a third party named Lynch Carpenter.
Montana Officials Call Breach “Deeply Disturbing”
The data breach wasn’t just a short one-time thing; this was months of information being leaked and possibly stolen, as the data breach took place between November 8, 2024, and March 5, 2025.
Montana State Auditor and Commissioner of Securities and Insurance James Brown was quoted as saying this breach was “not just a technical lapse” but framed it as a “deeply disturbing incident with far-reaching and jaw-dropping consequences for our citizens.”
Worse still, Blue Cross Blue Shield had promised to contact affected customers and offer credit monitoring; however, Commissioner Brown said he was unaware that this was happening.Canva
What Montana Residents Should Do Now?
All told there are 462,000 Montana residents who are members of Blue Cross Blue Shield of Montana (BCBSMT), and Commissioner Brown said he’s looking out for them, stating on X, formerly known as Twitter.
Montana is my home—and protecting our people is my job. We’ve launched a full-scale investigation into the Blue Cross Blue Shield data breach held by a 3rd party contractor to get answers and if the law was not followed to deliver accountability.
If you feel you’ve had your information compromised, make sure to look over your “Explanation of Benefits” statements and report suspicious activity immediately. You can also visit the Montana Commissioner of Securities and Insurance website here.
Sources: Lynch Carpenter, NBC Montana, KTVH, Newsweek
Click HERE to read the full article
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