OLDWICK, N.J.–(BUSINESS WIRE)–A.M. Best has placed under review with negative implications the Financial Strength Rating (FSR) of A (Excellent) and the Long-Term Issuer Credit Ratings (Long-Term ICR) of “a” of the key life/health subsidiaries, health maintenance organizations, New Zealand and European insurance companies of Cigna Corporation (Cigna) (Bloomfield, CT) [NYSE: CI]. Additionally, A.M. Best has placed under review with negative implications the FSR of A- (Excellent) and Long-Term I