Officials at the Delaware Department of Insurance said five health insurers and about 650 of their members were affected by a data breach at a third-party administrator in October, Delaware Online reports.
BenefitMall experienced a data breach Oct. 11, which officials say compromised some health insurance customers' data at Highmark BCBS, Aetna, Emblem Health, Humana and UnitedHealth.
The officials told Delaware Online that Aetna is mailing notification letters to its affected customers, and the other insurers may follow suit.
The department's investigation into the incident is ongoing, Delaware Insurance Commissioner Trinidad Navarro told the publication.