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Data breach puts medical info of 462,000 Blue Cross Blue Shield Montana customers at risk

A security lapse involving a third-party vendor exposed private medical data of over 462,000 Blue Cross Blue Shield Montana customers, officials reported recently.

  • Blue Cross Blue Shield of Montana reported the incident to the Montana State Auditor's Office and posted a notice after private medical information of more than 462,000 Montanans may have been exposed.
  • BCBSMT says the breach is linked to a security lapse involving a third-party vendor's systems, with no specific dates provided.
  • Reported notices list affected customers' records including names, addresses, birth dates, billing and medical data, phone numbers, and MTN has reached out to BCBSMT for comment.
  • The Montana State Auditor's Office has launched an investigation into BCBSMT after regulators warned of a `deeply disturbing incident` with far-reaching consequences for Montana citizens, according to officials.
  • Affected customers should review Explanation of Benefits statements and report suspicious activity, and visit the Montana Commissioner of Securities and Insurance website or call BCBSMT's dedicated member support line.
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KTVH broke the news in on Wednesday, October 22, 2025.
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