Arkansas Children’s Hospital says a former employee may have accessed personal and financial information of some 4,500 patients, perhaps for financial gain. The employee has been fired as a result of an investigation begun by the Social Security Administration.

Fox 16 reports that Children’s has notified patients of potential misuse of information from Nov. 7, 2016, to Feb. 6, 2018.

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According to a hospital release:

Working alongside law enforcement, ACH completed an audit of all the accounts that had been viewed by the individual while employed by the hospital. The investigation could not definitively confirm whether the former employee accessed information for business purposes or otherwise.

The hospital is providing patient families whose information may have been affected with complimentary credit monitoring and identity protection services through Experian. The one-year membership will allow parents to monitor their child’s personal information online and alert them if there are any signs that their child’s identity may have been stolen.

The hospital also recommends that affected families review the Explanation of Benefits they receive from their health insurer. If they see charges for services they did not receive, they should contact their insurer immediately.