HELENA — The Montana State Auditor and Commissioner of Securities and Insurance Office has launched an investigation into Blue Cross Blue Shield of Montana (BCBSMT) following a major data breach. According to the Auditor’s Office, the breach puts the personal and medical information of up to 462,000 Montana customers at risk.

BCBSMT is the largest health insurer in Montana.

(WATCH: Blue Cross Blue Shield of Montana investigated over data breach) Blue Cross Blue Shield of Montana investigated over data breach

"This breach is not just a technical lapse. This is a deeply disturbing incident with far-reaching and jaw-dropping consequences for our citizens," said Commissioner James Brown. "Montanans have every right to expect their personal data, especially sensitive health information, t

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