Illinois insurance officials mistakenly allowed the Social Security numbers of an unknown number of health care providers to be posted publicly . The Illinois Department of Insurance disclosed the privacy breach Friday in a news release . Department officials learned of it Monday after receiving a complaint . It 's unclear how long the Social Security numbers were viewable . The numbers were included in filings from Blue Cross Blue Shield , which Illinois provided to a website operated by the National Association of Insurance Commissioners . The national association said Friday it 's not aware of any previous disclosure of sensitive data occurring on its filings website . State officials say they took immediate action to remove the information from the website . They are notifying the health care providers involved and reviewing state procedures to prevent similar breaches . - See more at : http://wtax.com/news/101101-illinois-department-of-insurance-discloses-privacy-breach/#sthash.Z69fgZzZ.dpuf ;