Anthem Blue Cross recently began notifying an undisclosed number of physicians that their names, business addresses and Tax Identification Numbers (TINs) were mistakenly made available in PDF documents posted to the company's Web site from October 23, 2013 until October 24, 2013.
For those who use their Social Security numbers as their Tax Identification Numbers, their Social Security numbers were exposed.
"Once Anthem identified the error, we took immediate steps to remove the PDFs from the anthem.com/ca Web site," the notification letter [PDF] states. "The PDFs were corrected and re-posted without the TINs."
All those affected are being advised to review their accounts for suspicious activity, and are being offered one free year of identity protection services from AllClear ID.
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Correction: An earlier version of this article stated that customers' data had been published online, not physicians' data.