AIS Analysis Finds That Aetna/Humana Merger Could Cause Major MA Market-Share Shift

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Researchers at Atlantic Information Services have compiled a table showing, by county and state, selected Medicare Advantage markets that would undergo a massive market-share shift due to the proposed merger of Aetna and Humana.

Some Medicare Advantage (MA) markets could undergo a massive market-share shift due to the proposed merger of two major health insurance companies, researchers at Atlantic Information Services, Inc. (AIS) have found. The Department of Justice (DOJ) has flagged counties in 21 states in which Aetna, Inc. and/or Humana Inc. must divest some of their Medicare operations in order for the merger to proceed, AIS reports. Molina Healthcare agreed to acquire some 290,000 of those Medicare Advantage lives.

Analysis published on AIS’s Directory of Health Plans—Online Version (DHP) examines selected counties in each state that would be most affected by this transition. Combined, Aetna and Humana serve more than 400,000 MA lives in these counties alone, so the divestiture could impact more than half of those members.

AIS has determined that, currently, combined Aetna/Humana market share in selected counties highlighted by the DOJ ranges from roughly 35% to almost 96% in one county in Utah, and 63% market share – 100,715 lives – in Florida’s heavily populated Broward County. Overall, in the sample of counties from DOJ’s list that AIS examined, Aetna and Humana represent an average 62% market share.

AIS’s data has been compiled in a table examining both insurers’ market share in selected affected counties and is available in the From the Editors section of the DHP Demo website at

AIS’s Directory of Health Plans, which for 13 years has been a trusted resource for health plan market analysis, is now available for the first time as an interactive website. “AIS’s new subscription format works to keep our online subscribers informed about recent or potential market-share shifts,” says Susan Namovicz-Peat, director of AIS’s Directories and Databases Division. “The level of volatility from mergers, start-ups and exchange market exits means our customers need continuous insight to effectively apply our enrollment data in their market-share analyses.”

In addition to specially prepared analyses by the DHP editors, a newsfeed features original AIS reporting on events with potential impact on market share. Recent stories covered UnitedHealthcare’s planned purchase of Rocky Mountain Health Plans (RMHP), as well as the Department of Defense’s new TRICARE contract awards. Learn more and try a demo at

About DHP
AIS’s Directory of Health Plans is the most comprehensive resource available on the U.S. health plan market, with enrollment data and contact information for all health plans operating in the United States. By maintaining impeccable research standards and strict methodology through 13 annual editions, the Directory offers true year-over-year comparisons and extremely accurate and sensitive insight into developing trends. The all-new edition of the Directory is available as a printed book, as data files on a CD or USB Flash Drive, or — new for 2016 — as an interactive website, to permit the creation of specific analyses that suit the needs of each user. Learn more at

About AIS
Atlantic Information Services, Inc. (AIS) is a publishing and information company that has been serving the health care industry for nearly 30 years. It develops highly targeted news, data and strategic information for managers in hospitals and health systems, health insurance companies, medical group practices, purchasers of health insurance, pharmaceutical companies and other health care organizations. AIS products include print and electronic newsletters, databases, websites, looseleafs, strategic reports, directories, webinars, virtual conferences and training programs. Learn more at

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Susan Namovicz-Peat, Director, Directories and Databases Division
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since: 01/2011
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Atlantic Information Services, Inc.

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