OLDWICK, N.J.--(BUSINESS WIRE)--A.M. Best has placed the financial strength rating (FSR) of A (Excellent) and the issuer credit ratings (ICR) of “a” of the key life/health subsidiaries, the medical health maintenance organizations (HMO) and dental HMO subsidiaries of Cigna Corporation (collectively referred to as Cigna) (Bloomfield, CT) [NYSE:CI] under review with developing implications. Concurrently, the ICR of “bbb” of Cigna and its existing debt ratings have been placed under review with de


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