AM Best Affirms Credit Ratings of New Zealand Medical Indemnity Insurance Limited
AM Best has affirmed the Financial Strength Rating of B+ (Good) and the Long-Term Issuer Credit Rating of “bbb-” (Good) of
The ratings reflect NZMII’s balance sheet strength, which AM Best assesses as adequate, as well as its adequate operating performance, limited business profile and appropriate enterprise risk management (ERM).
NZMII’s balance sheet strength is underpinned by its risk-adjusted capitalisation being at the strongest level as of
NZMII’s operating performance is assessed as adequate, supported by a return-on-equity ratio of 25.8% and a net/net combined ratio of 66.3% in fiscal year 2024, as calculated by AM Best. The company’s overall operating performance has improved significantly since fiscal year 2021, as a result of remedial actions taken by the company’s management, including premium rate adjustments and shifting the composition of the investment portfolio to reduce investment risk. In addition, NZMII’s earnings remain supported by healthy investment income, with a net investment yield (including gains) of 8.2% in fiscal year 2024.
AM Best assesses NZMII’s business profile as limited given its position as a small and niche insurer in
NZMII’s ERM is assessed as appropriate given the size and complexity of its operations. A key risk over the medium to long term is the disestablishment of district health boards in
Ratings are communicated to rated entities prior to publication. Unless stated otherwise, the ratings were not amended subsequent to that communication.
This press release relates to Credit Ratings that have been published on AM Best’s website. For all rating information relating to the release and pertinent disclosures, including details of the office responsible for issuing each of the individual ratings referenced in this release, please see AM Best’s Recent Rating Activity web page. For additional information regarding the use and limitations of Credit Rating opinions, please view Guide to Best’s Credit Ratings. For information on the proper use of Best’s Credit Ratings, Best’s Performance Assessments, Best’s Preliminary Credit Assessments and AM Best press releases, please view Guide to Proper Use of Best’s Ratings & Assessments.
AM Best is a global credit rating agency, news publisher and data analytics provider specialising in the insurance industry. Headquartered in
Copyright © 2025 by A.M. Best Rating Services, Inc. and/or its affiliates. ALL RIGHTS RESERVED.
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Source: AM Best


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