SINGAPORE--(BUSINESS WIRE)--A.M. Best has upgraded the financial strength rating to A (Excellent) from A- (Excellent) and the issuer credit rating to “a” from “a-” of Union Medical Benefits Society Limited (UniMed) (New Zealand). The outlook for both ratings is stable. The upgrade reflects UniMed’s excellent risk-adjusted capitalization, continued favorable operating earnings and balanced investment portfolio, which has enabled it to consistently grow its capital and surplus. The rating action


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