OLDWICK, N.J.--(BUSINESS WIRE)--A.M. Best has placed under review with developing implications the financial strength rating of B++ (Good) and the issuer credit ratings (ICR) of “bbb” of Health Net of California, Inc., Health Net Life Insurance Company, Health Net Health Plan of Oregon, Inc. and Health Net of Arizona, Inc. A.M. Best also has placed under review with developing implications the ICR of “bb” and the debt rating of “bb” on the $400 million 6.375% senior unsecured notes due 2017 of