OLDWICK, N.J.--(BUSINESS WIRE)--A.M. Best has revised the outlook to positive from stable and affirmed the financial strength rating of A- (Excellent) and the issuer credit rating of “a-” of Medical Mutual Insurance Company of Maine (MMIC) (Portland, ME). The affirmations of MMIC’s ratings reflect the company’s strong balance sheet, favorable operating earnings, leadership position within the medical professional liability markets in which it operates and its high physician retention rate. The


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