Anthem Blue Cross said last week that it accidentally posted tax identification numbers for about 24,500 California doctors. Of that number, approximately 5,900 also had their Social Security numbers exposed.

According to the payor, the private information was mistakenly included with its online provider directory for about 24 hours late last month. After the error was identified, Anthem removed the information from its website. The insurer said this breach didn't involve any patient data.

A company spokesperson said all affected physicians were notified of the breach and offered free credit monitoring and credit insurance. Since this is not considered a HIPAA violation, the company only has to offer credit monitoring and insurance.

Any physicians who want more information should call AllClear at (877) 579-2267.