OLDWICK, N.J.–(BUSINESS WIRE)–A.M. Best has commented that the Credit Ratings (ratings) of Anthem, Inc. (Anthem) (Indianapolis, IN) [NYSE:ANTM] and its insurance subsidiaries remain unchanged following the announcement that Anthem has entered into an agreement to acquire HealthSun, an integrated system that includes a Medicare Advantage health plan and health care delivery network in Florida. The acquisition will strengthen Anthem’s enrollment in Florida adding about 40,000 Medicare Advantage