A guest column by the American Medical Association, exclusive to KevinMD.com.
When health plans have merged, they’ve said that a bigger insurance company would drive down premiums. The casual acceptance of this economic fallacy led to more than a decade of unchecked megamergers that helped health plans cement dominant market positions across the country.
It’s now clear that when health insurers talk about taking over another plan, what they often mean is taking over another market. Both research and anecdotal evidence indicate that bigger health insurers are not better. Health insurers consolidation has resulted in higher premiums, instead of the promised enhanced efficiencies and lower costs.
Mergers and acquisitions have produced large health insurers with monopoly power. That assessment is part of the AMA’s new study Competition in Health Insurance: A Comprehensive Study of U.S. Markets. According to the 2012 annual market analysis, higher premiums, watered-down benefits and growing insurer profitability suggest that a lack of health insurance market competition is harming patients and physicians.
Real physician voices, twice a week
Free, and one click to unsubscribe.
The AMA analysis concluded that anti-competitive conditions are present in 70 percent of 385 metropolitan areas in the U.S. Nearly 40 percent of metropolitan areas have one health insurer with a majority share of the commercial health insurance market. The results of the study should prompt federal and state antitrust authorities to more vigorously examine the anti-competitive effects of proposed mergers among health insurers.
The anti-competitive areas highlighted by the AMA analysis are vulnerable to a marketplace imbalance that favors powerful health insurers. A dominant health insurer can flex its monopolistic muscle to reduce payments to doctors and undermine the quality of care, without fear of losing business to a competitor.
High barriers to market entry help keep start-up competitors away and allow dominant health insurers to charge premiums above competitive levels. Start-up health insurers must meet costly state statutory and regulatory requirements. It can take several years and millions of dollars for a start-up insurer to begin competing with entrenched health insurers. Such conditions represent insurmountable barriers for start-up insurers to expand to new markets and offer a competitive choice to potential patients.
To increase competition and patient choice of health plans, the AMA supports an open marketplace model for health insurance exchanges created by the Affordable Care Act. Health insurance exchanges promise a new way for millions of Americans to obtain health care coverage from private insurers.
But there is a danger that large health insurers will have too much influence in the development, governance and operation of these exchanges. It is vital to include physicians and patients in the governing structures of health insurance exchanges to ensure they best meet the health care needs of residents in each state.
Jeremy Lazarus is President, American Medical Association.
The American Medical Association (AMA) is the largest and most influential organization representing the voices of hundreds of thousands of physicians, residents, and medical students across the United States. Founded in 1847, the AMA works to advance the interests of physicians and patients by advocating for policies that improve access to quality care, strengthen the patient-physician relationship, promote physician autonomy and well-being, advance science and technology, and uphold the high medical ethics of the profession. The AMA’s mission is to promote the art and science of medicine and the betterment of public health.
The AMA publishes updates on LinkedIn, Instagram, X, and Bluesky.

