OREANDA-NEWS. A.M. Best has revised the outlooks to negative from stable and affirmed the Financial Strength Rating (FSR) of A- (Excellent) and the Long-Term Issuer Credit Ratings (ICR) of “a-” of Blue Cross Blue Shield of Michigan Mutual Insurance Company (BCBSM) (Detroit, MI) and its subsidiary, Blue Care Network of Michigan (Southfield, MI).